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Published by capintec, 2015-10-09 11:55:51

CAPRAC ® -R Wipe Test / Well Counter Manual- Revision J

CAPINTEC, INC. CAPRAC®-R

CHAPTER 9

PERFORMANCE AND CALIBRATION

TEST OF CALIBRATION

To confirm calibration and internal operations, the CAPRAC®-R should be tested daily. The
Test of calibration:

• calculates the ratio of counts in certain channels to determine if the instrument is
properly calibrated,

• compares the difference between the calculated and measured activity of the
reference source, and

• determines the ratio of channel 1 to channel 4 plus 5 (for Cs137) or channel 3 plus 4
(for Ba133) to assure that the noise level for the unit is below the specified limit.

Note: The CAPRAC-R must be allowed to warm-up for a period of at least 45-60 minutes
and the ENTER key pressed once during that period before proceeding with any
radiation measurements or calibration settings. Failure to follow this important warm-
up procedure may result in erroneous results.

The Daily Test procedure is initiated from the Main Utility Menu. Press the WIPE and UTIL
keys to display Figure 9-1 Main Utility Menu.

f COUNT
TESTS
SETUP
DIAGNOSTICS

µ or ¶ to change
ENTER to select

Figure 9-1 Main Utility Menu

Use the ª arrow key to select TESTS. Press the ENTER key. The Tests Menu will appear as
shown in Figure 9-2 Tests Menu.

September 07 PERFORMANCE AND CALIBRATION 9-1

CAPINTEC, INC. CAPRAC®-R

f DAILY
BLOOD TESTS

SCHILLING TEST

MDA TEST

µ or ¶ to change
ENTER to select

Figure 9-2 Tests Menu

Use the ª arrow key to select DAILY. Press the ENTER key.
Depending on the standard reference source selected, one of the following screens will
appear:

TEST

MEASURE CS137

ENTER to Continue

Figure 9-3a Cs137 Test Screen

TEST
MEASURE BA133

ENTER to Continue

Figure 9-3b Ba133 Test Screen

Note: If the message “INPUT STANDARD SOURCE DATA” appears, the reference source
data must be entered into the unit before performing the daily Test (refer to
CHAPTER 2: INSTALLATION AND SETUP).

If the message “MUST PERFORM AUTO CAL BEFORE TEST” appears, perform
Auto Cal prior to proceeding with the daily Test. Auto Cal must be performed when
the standard reference source has been changed or at the time of initial unit setup. A

9-2 PERFORMANCE AND CALIBRATION September 07

CAPINTEC, INC. CAPRAC®-R

review of Auto Cal is included in the next section of this chapter and is included in
CHAPTER 2: INSTALLATION AND SETUP.

Place the appropriate reference source in the detector and press the ENTER key. Figure 9-4
Test Counting Period Screen will appear.

20s

µ or ¶ to change
COUNT to Start

Figure 9-4 Test Counting Period Screen

Shading indicates the active portion of the display. Use the © or ª arrow keys to set the
number of seconds for the Test procedure. The five choices for counting are 20, 60, 180, 600
and 1800 seconds. When the correct time is displayed, press the COUNT key.

Figure 9-5 Test Count Screen (Graph Display) will appear. The time on the bar graph will
count down from the initial setting (e.g. 60s) to zero. The graph will display counts detected
in each of the CAPRAC-R’s six channels. The CAPRAC-R updates the bar graph and cpm
each second; therefore, the bar lengths and cpm values will change throughout the counting
period.

k 660 kcpm,n
e 400
V 200 0.39
40.70
100 49.20
61.40
39.36
80.43

Figure 9-5 Test Count Screen (Graph Display)

To view the Test information in a number format (as shown in Figure 9-6 Test Count Screen
(Number Display)), press the DISPLAY key. The number display shows total counts (C) and
the rate of disintegrations per minute (dpm). The CAPRAC-R calculates dpm by multiplying
the counts per minute by the conversion factor (CF) for the unit’s standard reference source.

September 07 PERFORMANCE AND CALIBRATION 9-3

CAPINTEC, INC. CAPRAC®-R

38s

52.20kc
120.17kcpm

Figure 9-6 Test Count Screen (Number Display)

When the TEST procedure is complete, the system prints a paper strip (if a printer is
attached to the system) that illustrates the calculated versus measured activity of the
reference source and the ratio of counts in certain CAPRAC-R channels. If the screen
display was in the graph format at the conclusion of the counting period, the paper strip will
look similar to Figure 9-7 Final Test Count, Cs137 (Paper Strip).

9-4 PERFORMANCE AND CALIBRATION September 07

CAPINTEC, INC. CAPRAC®-R

Figure 9-7 Final Test Count, Cs137 (Paper Strip)

If the screen display was in the number format at the conclusion of the counting period, total
counts and the rate in dpm will be printed on the paper strip (if a printer is attached to the
system) and the horizontal bar graph will be excluded.

Test results that fall outside an accepted measurement will be displayed in RED on the
printed paper strip (if a printer is attached to the system) and BOLD on the display screen.

September 07 PERFORMANCE AND CALIBRATION 9-5

CAPINTEC, INC. CAPRAC®-R

When test results fall outside an acceptable range, perform the Auto Cal function (discussed
in the next section of this chapter) prior to counting any wipe samples.

The last line on the printout (if a printer is attached to the system) gives a number called the
‘GAIN REFERENCE’. The gain reference is the setting for the internal pulse height analyzer.
The accepted range for this number is 0-4095. If a service call is made, the Capintec’s
Authorized Service Center may ask for the most recent gain reference number from the Test
function.

For CAPRAC-R users that do not use the optional printer, the same printout information is
displayed in segments (as shown in the following figures). When a measurement exceeds
trigger levels, the number is shaded on the screen as shown in Figure 9-7 Final Test Count,
Cs137 (Paper Strip).

CS137: 106.6 nCi
MEASD: 91.1 nCi

DEVIATION: -13.9%

ENTER to Continue

Figure 9-8 First Test Results Screen

ENERGY
DEVIATION: 5.8%

GAIN REF: 1355

ENTER to Continue

Figure 9-9 Second Test Results Screen

Ch1/(Ch4+Ch5): 1.01
Measures as: 0.98
Deviation: -2.9%
ENTER to Continue

Figure 9-10 Third Test Results Screen

9-6 PERFORMANCE AND CALIBRATION September 07

CAPINTEC, INC. CAPRAC®-R

TRIGGER LEVELS

WIPE:2000.0 dpm
UNRESTRICT: 200.0 dpm

SEALED: 5.0 nCi
BACKGROUND:1000.0 cpm

ENTER to Continue

Figure 9-11 Fourth Test Results Screen

Calibration Ratios

The CAPRAC-R calculates ratios of counts in channels as determined by the reference
source selected. Cesium-137 has an energy peak of 662 keV (the appropriate boundary
between channels 4 and 5). The expected ratio between the number of counts in channel 4
and channel 5 is 0.7. The CAPRAC-R calculates the channel 4/5 ratio and converts that
number to percent energy deviation. Similarly, the expected ratio of channel 3 and 4 for Ba-
133 is 0.9. The CAPRAC-R will calculate this ratio and will convert the number to percent
energy deviation.

The Test feature also compares the difference between the calculated and measured activity
of the reference source and prints this information on the paper strip (if a printer is attached
to the system) or reports the findings on Figure 9-8 First Test Results Screen.

Finally, the Test function determines the ratio of channel 1 to either channel 4 plus 5 (for Cs-
137) or channel 3 plus 4 (for Ba-133) to determine that the noise level of the CAPRAC-R is
below the specified limit.

Table 9-1 CAPRAC-R Calibration Limits:

Test Function Findings Reported As:

Activity > 10% deviation Value prints in RED
> 99% deviation Error Message appears
Reference Source > 2.5% deviation Value prints in RED
Energy Change > 5% deviation Error Message appears
Channel 1 Ratio to > 20% deviation Value prints in RED
Channel 4+5 or 3+4 >500% deviation Error Message appears

If the Test function measurements exceed expected parameters in any area, the CAPRAC-R
will need to be recalibrated with the Auto Cal function.

September 07 PERFORMANCE AND CALIBRATION 9-7

CAPINTEC, INC. CAPRAC®-R

AUTO CAL – CAPRAC-R SELF CALIBRATION

The CAPRAC-R calculates ratios of the counts in certain channels to assess if the instrument
is properly calibrated. Cs137 has an energy peak of 662 keV (the approximate boundary
between channels 4 and 5). The ratio of counts detected for channel 4 to channel 5 should
be 0.7. Similarly, since Ba133 has an energy peak around 400 keV (the boundary between
channels 3 and 4), the expected ratio of counts for channel 3 to channel 4 should be 0.9. The
CAPRAC-R calculates the expected channel ratio and converts this value to percent keV
change, or energy deviation.

If the counts in these channels to not meet the expected ratio, the CAPRAC-R adjusts the
internal high voltage until the ratio is correct.

The Auto Cal function is performed:
• at the time of installation,
• when standard reference sources are changed, and
• when any TEST function measurement falls outside acceptable limits.

To initiate the Auto Cal program, press the WIPE and UTIL keys to display Figure 9-12 Main
Utility Menu.

f COUNT
TESTS
SETUP
DIAGNOSTICS

µ or ¶ to change
ENTER to select

Figure 9-12 Main Utility Menu

Use the ª arrow key to select SETUP. Press the ENTER key. Figure 9-13 Setup Menu will
appear.

TIME
AUTO CAL
f OTHER

Figure 9-13 Setup Menu
Use the ª arrow key to move the cursor to select AUTO CAL. Press the ENTER key.

9-8 PERFORMANCE AND CALIBRATION September 07

CAPINTEC, INC. CAPRAC®-R

Figure 9-14 Auto Cal Screen will appear directing the user to measure the selected standard
reference source previously entered.

AUTO CAL
MEASURE CS137

ENTER to Continue

Figure 9-14 Auto Cal Screen

The CAPRAC-R self-calibrates with a Cs137 or Ba133 standard reference source. The
calibrated activity of the source should be in the range of 0.1-1.0 µCi (3.7-37 kBq).
Place the appropriate reference source in the detector and press the ENTER key. Figure 9-
15 Auto Cal Counting Period Screen will appear.

20s

µ or ¶ to change
COUNT to Start

Figure 9-15 Auto Cal Counting Period Screen

Shading indicates the active portion of the display. Using the © or ª arrow keys, set the
number of seconds for the AUTO CAL procedure. The five choices for counting are 20, 60,
180, 600 and 1800 seconds. When the correct time is displayed, press the COUNT key to
begin the AUTO CAL procedure. The message” AUTO CAL IN PROGRESS – PLEASE
WAIT” will be displayed.

Figure 9-16 Auto Cal Count (Cs137) will appear as the CAPRAC-R begins counting the
reference source.

September 07 PERFORMANCE AND CALIBRATION 9-9

CAPINTEC, INC. CAPRAC®-R

k 660 kcpm,n
e 400
V 200 0.39
40.70
100 49.20
61.40
39.36
80.43

Figure 9-16 Auto Cal Count (Cs137)

If an internal adjustment is required, the CAPRAC-R will automatically adjust the high
voltage, and then the counting period will begin again. Numerous counting periods may be
performed as the CAPRAC-R adjusts the high voltage to meet the required specifications.
Between high voltage adjustments, the unit will wait three seconds to give the high voltage
time to adjust, and then begin another Auto Cal counting period.

Pressing the DISPLAY key will change the display from bar graph display to total number of
net counts (C) and disintegrations per minute (dpm).

When the system has completed the calibration process, the data will be printed on the
paper strip (if a printer is attached to the system) and the main screen will return to the Main
Utility Menu.

9 - 10 Figure 9-17 Final Auto Cal Results (Paper Strip) September 07

PERFORMANCE AND CALIBRATION

CAPINTEC, INC. CAPRAC®-R

Gain Reference

The Gain Reference is the number between 0 and 4095 that represents the setting of the
high voltage. The CAPRAC-R is calibrated at Capintec’s Authorized Service Center. If your
CAPRAC-R requires service, the Gain Reference number can help to diagnose the problem.
Variables that affect the gain reference include:

• Temperature,

• Aging of the detector, and

• Geometry of the calibration source.

Repeat Background Count after Auto Cal

The Auto Cal procedure adjusts the gain in the CAPRAC-R. The gain adjustment may affect
the count distribution in each channel; therefore, the background count MUST be repeated
after completing the Auto Cal procedure. Remember that the background count must be
saved into the CAPRAC-R memory by pressing the ENTER key before exiting the program.

Auto Cal Limits
The auto calibration limits for energy deviation are: <1%

The following tables list the channel ratio limits for Cs137 and Ba133.

Table 9-2 Channel ratio limits for Cesium-137

CHANNEL RATIO LIMITS

CH1/(CH4 + CH5) Standard Well 600 Well (optional)
CH6/(CH4 + CH5) 0.63 to 1.35 0.33 to 0.69
≤ 0.02 ≤ 0.02

Table 9-3 Channel ratio limits for Barium-133

CHANNEL RATIO LIMITS

CH1/(CH3 + CH4) Standard Well 600 Well (optional)
CH6/(CH3 + CH4) 0.84 to 1.8 0.54 to 1.14
≤ 0.02 ≤ 0.02

September 07 PERFORMANCE AND CALIBRATION 9 - 11

CAPINTEC, INC. CAPRAC®-R

Auto Calibration Errors

There are several conditions that would cause the CAPRAC-R to fail Auto Cal:
• Using the wrong standard reference source during calibration,
• Removing the standard reference source during calibration,
• The presence of another source near the detector during calibration,
• System malfunction.

If the unit calibrates, but finds a ratio for either Cs137 or Ba133 outside the allowable limit,
the printout will display the unacceptable ratios in RED and include the word “ERROR” (if a
printer is attached to the system). Check that the proper reference source is in the well, that
no other sources are nearby and repeat the calibration procedure. If the problem persists,
contact Capintec’s Authorized Service Center.

The message “ERROR: TOO MANY COUNTS UPPER CHANNEL – SEE MANUAL” will be
displayed if the unit calibrates, but finds an excessive number of counts in the upper
channels. This error is usually caused by the use of the wrong reference source during
calibration. If the correct reference source was used and this problem persists, contact
Capintec’s Authorized Service Center.

The message “SOURCE IS TOO WEAK” will be displayed when the count rate measured in
all channels added together does not exceed 5000 cpm. This low count rate is usually the
result of not placing the standard reference source in the detector, or when the standard
reference source is too weak. The recommended activity for a standard reference source is
0.1-1.0 µCi (3.7-37 kBq). If the correct standard reference source with the appropriate activity
has been placed in the detector and the message continues to be displayed, contact
Capintec’s Authorized Service Center.

The message “AUTO CALIBRATION OUT OF RANGE – SEE MANUAL” will be displayed if
the unit is unable to calibrate. This error can be caused by the following:

• Use of the wrong standard reference source during calibration,
• A large shift in calibration that the CAPRAC-R is unable to recover from, or
• Operation of the CAPRAC-R in an environment that exceeds the recommended

ambient operating temperature range.

If this error persists, contact Capintec’s Authorized Service Center.

9 - 12 PERFORMANCE AND CALIBRATION September 07

CAPINTEC, INC. CAPRAC®-R

CHAPTER 10

DIAGNOSTICS

The Diagnostics feature on the CAPRAC®-R performs two primary functions:
1. Prints a list of the 68 factory installed radionuclides and their corresponding half-lives
as well as the conversion factors and channel assignment built-in or selected by the
user. Additionally, any user-defined nuclides that have been added to the system,
including their conversion factors and assigned channels will be included on the
paper strip printout (if a printer is attached to the system).
2. Performs internal diagnostic functions on the unit.

To perform the diagnostic function, press the WIPE and UTIL keys to display Figure 10-1
Main Utility Menu.

f COUNT
TESTS
SETUP
DIAGNOSTICS

µ or ¶ to change
ENTER to select

Figure 10-1 Main Utility Menu

Select DIAGNOSTICS and press the ENTER key. The system immediately prints (if a printer
is attached to the system) the radionuclide list (Figure 10-2 Diagnostics Printout) and Figure
10-3 Diagnostics Screen is displayed.

September 07 DIAGNOSTICS 10 - 1

CAPINTEC, INC. CAPRAC®-R

10 - 2 Figure 10-2 Diagnostics Printout September 07

DIAGNOSTICS

CAPINTEC, INC. CAPRAC®-R

DIAGNOSTICS

RAM: PASS
PROM:

PLEASE WAIT

Figure 10-3 Diagnostics Screen

Do NOT press any keys to end the Diagnostic function until the “PLEASE WAIT” message
disappears from the screen and the final report (Figure 10-4 Diagnostics Screen) is
displayed. The printer may pause for a few seconds after printing the radionuclide list before
printing the last few lines of CAPRAC-R system diagnostic information (if a printer is attached
to the system). During this time, the CAPRAC-R is checking the contents of its internal
memories.

DIAGNOSTICS

RAM: PASS
PROM: PASS
5758 28D1 CD4C
4173 0F75 FDBB
EEPROM: PASS
ENTER to Continue

Figure 10-4 Diagnostics Screen

The numbers below the PROM: PASS line are a check of the CAPRAC-R memory.
Depending on the version of software in the CAPRAC-R, the numbers shown in this manual
may differ from those on the CAPRAC-R screen.

Press the ENTER key to return to Figure 10-1 Main Utility Menu.

Note: If the final report displayed (Figure 10-4 Diagnostics Screen) contains the word
“FAIL” for the RAM, PROM, or EEPROM line, the CAPRAC-R is malfunctioning.
Please contact Capintec’s Authorized Service Center in Pittsburgh, phone: (412) 963-
1988, FAX (412) 963-0610.

September 07 DIAGNOSTICS 10 - 3



CAPINTEC, INC. CAPRAC®-R

CHAPTER 11

ACCEPTANCE AND QUALITY
ASSURANCE TESTS

GENERAL

To insure proper operation of the CAPRAC®-R, Capintec recommends that the following
procedures be performed at the intervals indicated in Table 11-1 Recommended Quality
Assurance Test Intervals.

Additionally, it is recommended that periodic (every five years) re-calibration of the unit be
performed by Capintec to guarantee that the instrument’s high reliability is maintained.

ACCEPTANCE TESTS

The following tests must be performed – in the following order – before the initial use of the
CAPRAC-R:

 Diagnostics
 Background
 Auto Cal
 Measure CF
 Auto Cal
 Test

Diagnostic Test

Diagnostics is a system diagnostic test that assesses the instrument’s memories and
programs. The procedure takes approximately 1 to 2 minutes. The results are printed (if a
printer is attached to the system) and displayed on the CAPRAC-R display screen. If any of
the results (RAM, PROM or EEPROM) fail, contact Capintec’s Authorized Service Center.
Refer to CHAPTER 10: CAPRAC-R DIAGNOSTICS, for detailed information regarding the
Diagnostic test.

Background

Before initial use and on a daily basis, the background test must be performed prior to
counting any wipe samples on the CAPRAC-R. The procedure takes approximately 1 minute.
Refer to CHAPTER 3: GENERAL OPERATING INSTRUCTIONS, for detailed information
regarding the Background test.

March 10 ACCEPTANCE & QA TESTS 11 - 1

CAPINTEC, INC. CAPRAC®-R

Auto Cal
Before initial use and on a daily basis, Auto Cal should be performed. The test takes
approximately 3-8 minutes depending on the number of high voltage adjustments required.
Refer to CHAPTER 9: PERFORMANCE AND CALIBRATION, for a detailed description of
the Auto Cal procedure.

Test
Before initial use and at the beginning of each work day, a Test of calibration should be
performed. The procedure takes approximately 2 minutes. See CHAPTER 9:
PERFORMANCE AND CALIBRATION, for a detailed description of the Test procedure.

QUALITY ASSURANCE TESTS

The following table summarizes the recommended quality assurance tests and time intervals
for the CAPRAC-R wipe test monitor:

Table 11-1 Recommended Quality Assurance Test Intervals

DESCRIPTION DAILY INTERVAL QUARTERLY
X WEEKLY X
Test X
Background X X X
Auto Cal X X
Diagnostics X
Contamination Test X

Contamination Test

Contamination of the well liner can be a primary cause of erroneous wipe results on the
CAPRAC-R. To minimize the potential for error, a test for contamination should be performed
at the beginning of each work day prior to performing the first wipe measurement and on a
weekly basis at the end of the work day.

1. Confirm that the well liner is in place and the well detector is empty.
2. Press WIPE, BKG, ENTER and then COUNT.
3. Record the total counts per minute displayed on the screen (liner counts).
4. Remove the well liner.
5. Repeat the test by pressing WIPE, BKG, ENTER and then COUNT.
6. Record the total counts per minute displayed on the screen (empty well counts).
7. Subtract the liner counts from the empty well counts to determine the net counts per

minute from possible contamination of the well liner:

11 - 2 ACCEPTANCE & QA TESTS March 10

CAPINTEC, INC. CAPRAC®-R

Liner counts (cpm) - Empty Well count (cpm)  Net Well Counts *

* If the net well counts are >100 cpm, the well liner should be decontaminated or replaced.

CAUTION

Never use the CAPRAC-R without a well liner. Liners are inexpensive and easy to replace.
A contaminated detector is a very costly mistake.

March 10 ACCEPTANCE & QA TESTS 11 - 3



CAPINTEC, INC. CAPRAC®-R

CHAPTER 12

THE PRINTER

The Capintec CAPRAC®-R comes with an optional printer (Epson Model TM-U220D). The
printer comes with a separate owner’s manual (“Installation Guide”) that includes instructions
on loading new paper and ribbons.

When operating the CAPRAC-R, the printer should be turned on. The green POWER light on
the front panel should be lit. If the POWER light is not on, check the printer’s on/off switch
and the cables that connect the printer to the electrical power supply.

To advance the paper strip, press the FEED keypad until the paper moves to the desired
length.

September 07 PRINTER 12 - 1



CAPINTEC, INC. CAPRAC®-R

CHAPTER 13

ERROR AND WARNING MESSAGES

The following list of errors and warning messages appears in alphabetical order.

BACKGROUND TOO HIGH

BKG TOO HIGH

ENTER to Continue

Figure 13-1 Background Too High Screen

This message appears if the CAPRAC-R trigger level for background activity is exceeded
and may be caused by the following:

• Contaminated detector cavity or liner,
• radioactive sources near the CAPRAC-R, or
• contaminated hands.

Eliminate any sources of contamination, then press the ENTER key to repeat the
background. If the background is still too high, check trigger level (CHAPTER 5: TRIGGER
LEVELS: SETTING COUNT LIMITS) to see if the background limit has been set too low or
consider shielding the CAPRAC-R with lead bricks to help reduce the background level. If all
possible sources of contamination have been eliminated and it is necessary to set the trigger
level to a high level to operate, the CAPRAC-R may not be functioning properly. In this case,
contact Capintec’s Authorized Service Center in Pittsburgh, phone: (412) 963-1988, FAX
(412) 963-0610.

September 07 ERROR & WARNINIG MESSAGES 13 - 1

CAPINTEC, INC. CAPRAC®-R

COUNTING RATE TOO HIGH

COUNTING RATE
TOO HIGH
REMOVE SOURCE

ENTER to Continue

Figure 13-2 Counting Rate Too High Screen

This message appears if you place a sample or source in the detector that exceeds the
CAPRAC-R’s maximum count rate of 60,000 counts per second (cps).
Standard sources for testing and calibrating the CAPRAC-R should be in the range of 0.1-1.0
µCi (3.7-37 kBq).

INPUT ERROR

INPUT ERROR
SEE MANUAL

ENTER to Continue

Figure 13-3 Input Error Screen

This message appears if a numerical value that does not fall within the CAPRAC-R’s
accepted minimum and maximum range values. For example, entering a 00.00 half life or
setting an activity level that exceeds the allowable limit would trigger this error. Press the
ENTER key to return to the previous screen where another value can be entered.

13 - 2 ERROR & WARNINIG MESSAGES September 07

CAPINTEC, INC. CAPRAC®-R
MEASURE BKG

MEASURE BKG

Figure 13-4 Measure Bkg Screen

This message appears if a wipe sample measurement is attempted when the background
activity has not been measured, and recorded within the past 24 hours. It can also appear if
the user exits the background program before the background results have been saved in
the system by pressing the ENTER key. Repeat the background count by pressing the BKG
key and press the ENTER key at the conclusion of the counting period to save the data in the
system.

MUST PERFORM AUTO CAL

MUST PERFORM
AUTO CAL

BEFORE TEST

ENTER to Continue

Figure 13-5 Must Perform Auto Cal Screen

This message appears the first time the TEST function is attempted after changing the
standard reference source data. The Auto Cal function must be performed before the TEST
procedure when the standard reference source data is changed or entered for the first time.

September 07 ERROR & WARNINIG MESSAGES 13 - 3

CAPINTEC, INC. CAPRAC®-R
PLEASE WAIT

PLEASE WAIT

Figure 13-6 Please Wait Screen

This message appears when the CAPRAC-R is performing a function that may take some
time to complete (e.g. Auto Cal). Do NOT press any keys on the keyboard while this
message is displayed on the CAPRAC-R screen.

NO ROOM TO ADD

No Room To Add
User Nuclide

Write Over a
User Nuclide?

Yes(µ) or No(¶):

Figure 13-7 No Room Too Add Screen

This message appears if all 10 spaces allocated in the CAPRAC-R memory for user-defined
nuclides are occupied. When this message appears, follow the directions in CHAPTER 8:
USER-DEFINED NUCLIDES.

13 - 4 ERROR & WARNINIG MESSAGES September 07

CAPINTEC, INC. CAPRAC®-R

CHAPTER 14

BLOOD TESTS

GENERAL

The Plasma Volume and RBC Volume tests discussed in this chapter are based primarily on
the protocols described in the Mallinckrodt package inserts. It is important that each user
reviews and confirms that the protocols in the CAPRAC®-R software are compatible with the
protocols of the institution.

To access the Blood Tests, press the WIPE and UTIL keys to display Figure 14-1 Main
Utility Menu.

f COUNT
TESTS
SETUP
DIAGNOSTICS

µ or ¶ to change
ENTER to select

Figure 14-1 Main Utility Menu

Use the ª arrow key to select TESTS. Press the ENTER key. The Tests Menu will appear as
shown in Figure 14-2 Tests Menu.

f DAILY
BLOOD TESTS
SCHILLING TEST
MDA TEST

µ or ¶ to change
ENTER to select

Figure 14-2 Tests Menu

Use the ª arrow key to select BLOOD TESTS. Press the ENTER key. Figure 14-3 Blood
Tests Menu will appear.

September 07 BLOOD TESTS 14 - 1

CAPINTEC, INC. CAPRAC®-R

f PLASMA VOLUME
RBC VOLUME

µ or ¶ to change
ENTER to select

Figure 14-3 Blood Tests Menu

PLASMA VOLUME (I-125)

From the Blood Test Menu, press the ENTER key to select PLASMA VOLUME. Figure 14-4
Plasma Volume Dilution Factor Screen will appear.

PLASMA VOLUME
DILUTION FACTOR

1000.

µ ¶ ´ to change
ENTER to accept

Figure 14-4 Plasma Volume Dilution Factor Screen

Use the © or ª and ¨ arrow keys to enter the dilution factor for the plasma volume. When
the correct dilution factor is displayed, press the ENTER key. Figure 14-5 Plasma Volume
Sample Volume Screen will appear.

PLASMA VOLUME
SAMPLE FACTOR

4.0 ml

µ ¶ ´ to change
ENTER to accept

Figure 14-5 Plasma Volume Sample Volume Screen

The whole blood sample and subsequent plasma sample is taken from whole blood
withdrawn from the patient 5-10 minutes post injection.

14 - 2 BLOOD TESTS September 07

CAPINTEC, INC. CAPRAC®-R

Use the © or ª and ¨ arrow keys to enter the volume for the standard, whole blood and
plasma samples.

Note: To avoid a geometric counting error, the sample volumes, sample containers and
placement of samples in the well must be the same. Any variations to these
parameters will require an appropriate correction factor be applied to the final
calculations.

When the correct sample volume is displayed, press the ENTER key. Figure 14-6 Plasma
Volume Hematocrit Screen will appear.

PLASMA VOLUME
HEMATOCRIT

50.0 %

µ ¶ ´ to change
ENTER to accept

Figure 14-6 Plasma Volume Hematocrit Screen

Use the © or ª and ¨ arrow keys to enter the hematocrit determined from the whole blood
sample drawn from the patient 5-10 minutes post injection. When the correct hematocrit is
displayed, press the ENTER key. Figure 14-7 Plasma Volume – Patient’s Weight Screen will
appear.

PLASMA VOLUME
WEIGHT

60.0 kg

µ ¶ ´ to change
ENTER to accept

Figure 14-7 Plasma Volume – Patient’s Weight Screen

Use the © or ª and ¨ arrow keys to enter the patient’s weight. When the correct weight is
displayed, press the ENTER key.

Background Count
Once the sample volumes and patient data have been entered, the test begins with a
background count as shown in Figure 14-8 Prompt to Measure Room Background.

September 07 BLOOD TESTS 14 - 3

CAPINTEC, INC. CAPRAC®-R

PLASMA VOLUME

MEASURE ROOM
BACKGROUND

ENTER to Continue

Figure 14-8 Prompt to Measure Room Background

Verify that no sources are in the area and press the ENTER key to continue. Figure 14-9
Measure Plasma Volume Background will appear.

BKG 20s

µ or ¶ to change
COUNT to Start

Figure 14-9 Measure Plasma Volume Background

Shading indicates the active portion of the display. Use the © or ª arrow keys to set the
number of seconds for the Test procedure. The five choices for counting are 20, 60, 180, 600
and 1800 seconds.

Note: The counting period is set for all sample counts. Once the counting period has been
accepted, it cannot be changed during the test.

When the correct time is displayed, press the COUNT key.

Pressing the COUNT(START/STOP) key at any time during the measurement will abort the
measurement and return to Figure 14-8 Prompt to Measure Room Background.
When the Background measurement is complete, press the © arrow key to accept the
measurement or the ª arrow key to repeat the measurement.

Sample Counts
After accepting the Background measurement, Figure 14-10 Measure Plasma Volume
Standard will appear.

14 - 4 BLOOD TESTS September 07

CAPINTEC, INC. CAPRAC®-R

PLASMA VOLUME

MEASURE
STANDARD

ENTER to Continue

Figure 14-10 Measure Plasma Volume Standard

Place the Reference Standard supplied with the kit into the well. Press the ENTER key to
begin counting.
When the Reference Standard measurement is complete, press the © arrow key to accept
the measurement or the ª arrow key to repeat the measurement.

After accepting the Reference Standard measurement, Figure 14-11 Measure Whole Blood
Sample will appear.

PLASMA VOLUME

MEASURE WHOLE
BLOOD SAMPLE

ENTER to Continue

Figure 14-11 Measure Whole Blood Sample

Place the Whole Blood sample into the well. Press the ENTER key to begin counting.
When the Whole Blood sample measurement is complete, press the © arrow key to accept
the measurement or the ª arrow key to repeat the measurement.

After accepting the Whole Blood sample measurement, Figure 14-12 Measure Plasma
Sample will appear.

September 07 BLOOD TESTS 14 - 5

CAPINTEC, INC. CAPRAC®-R

PLASMA VOLUME

MEASURE
PLASMA SAMPLE

ENTER to Continue

Figure 14-12 Measure Plasma Sample

Place the Plasma sample into the well. Press the ENTER key to begin counting.
When the Plasma sample measurement is complete, press the © arrow key to accept the
measurement or the ª arrow key to repeat the measurement.

Plasma Volume Calculations
After accepting the Plasma sample measurement, the results screens will appear.
The results that are displayed on the five consecutive screens and the paper printout (if a
printer is attached to the system) are calculated as follows:
SV = Sample Volume
DF = Dilution Factor

Plasma Volume (ml) = SV × DF × Net Reference Standard Counts
Net Plasma Counts

Whole Blood Volume (ml) = SV × DF × Net Reference Standard Counts
Net Whole Blood Counts

RBC Volume (ml) = Blood Volume - Plasma Volume

Calculated Hematocrit = Red Cell Volume
Whole Blood Volume

Note: It is recommended that a comparison of the calculated hematocrit be made with the
microhematocrit to verify the accuracy of the procedure and calculations.

14 - 6 BLOOD TESTS September 07

CAPINTEC, INC. CAPRAC®-R

Plasma Volume Results Display 14 - 7

BKG :50.00 cpm
STAND:535.1kcpm
BLOOD:6299. cpm
PLSMA:1111. cpm

ENTER to Continue

Figure 14-13 Plasma Volume Results Screen #1

PLASMA VOLUME
XXXX. ml
xx. ml/kg

ENTER to Continue

Figure 14-14 Plasma Volume Results Screen #2

BLOOD VOLUME
XXXX. ml
xx. ml/kg

ENTER to Continue

Figure 14-15 Plasma Volume Results Screen #3

RBC VOLUME
XXXX. ml
xx. ml/kg

ENTER to Continue

Figure 14-16 Plasma Volume Results Screen #4

September 07 BLOOD TESTS

CAPINTEC, INC. CAPRAC®-R

CALCULATED
HEMATOCRIT

xx.x %

ENTER to Continue

Figure 14-17 Plasma Volume Results Screen #5

RBC VOLUME (Cr51) )

From Figure 14-3 Blood Tests Menu, use the ª arrow key to set the cursor to RBC
VOLUME. Press the ENTER key. Figure 14-18 RBC Volume Dose Hematocrit will appear.

RBC VOLUME
DOSE HCT

50.0 %

µ ¶ ´ to change
ENTER to accept

Figure 14-18 RBC Volume Dose Hematocrit

The Dose Hematocrit is the hematocrit of the tagged RBC suspension determined from the
remainder of the suspension of the injection into the patient.
Use the © or ª and ¨ arrow keys to enter the Dose Hematocrit. When the correct Dose
Hematocrit is displayed, press the ENTER key. Figure 14-19 RBC Volume Patient
Hematocrit will appear.

RBC VOLUME
PATIENT HCT

50.0 %

µ ¶ ´ to change
ENTER to accept

Figure 14-19 RBC Volume Patient Hematocrit

14 - 8 BLOOD TESTS September 07

CAPINTEC, INC. CAPRAC®-R

The Patient Hematocrit is the hematocrit of the blood sample withdrawn from the patient 10-
20 minutes post injection.
Use the © or ª and ¨ arrow keys to enter the Patient Hematocrit. When the correct Patient
Hematocrit is displayed, press the ENTER key.Figure 14-20 RBC Volume – Patient’s Weight
will appear.

RBC VOLUME
WEIGHT

60.0 kg

µ ¶ ´ to change
ENTER to accept

Figure 14-20 RBC Volume – Patient’s Weight

Use the © or ª and ¨ arrow keys to enter the patient’s weight in kilograms. When the
correct weight is displayed, press the ENTER key.

Background Count
Once the hematocrit values and patient data have been entered, the test begins with a
background count as shown in Figure 14-21 Prompt to Measure Room Background.

RBC VOLUME

MEASURE ROOM
BACKGROUND

ENTER to Continue

Figure 14-21 Prompt to Measure Room Background

Verify that no sources are in the area and press the ENTER key to continue. Figure 14-22
Measure RBC Volume Background will appear.

September 07 BLOOD TESTS 14 - 9

CAPINTEC, INC. CAPRAC®-R

BKG 20s

µ or ¶ to change
COUNT to Start

Figure 14-22 Measure RBC Volume Background

Shading indicates the active portion of the display. Use the © or ª arrow keys to set the
number of seconds for the Test procedure. The five choices for counting are 20, 60, 180, 600
and 1800 seconds.
Note: The counting period is set for all sample counts. Once the counting period has been

accepted, it cannot be changed during the test.
When the correct time is displayed, press the COUNT key.
Pressing the COUNT(START/STOP) key at any time during the measurement will abort the
measurement and return to Figure 14-21 Prompt to Measure Room Background.
When the Background measurement is complete, press the © arrow key to accept the
measurement or the ª arrow key to repeat the measurement.

Sample Counts
After accepting the Background measurement, Figure 14-23 Measure RBC Volume Whole
Blood Standard will appear.

RBC VOLUME

MEASURE WHOLE
BLOOD STANDARD

ENTER to Continue

Figure 14-23 Measure RBC Volume Whole Blood Standard

The Whole Blood Standard is s solution made from a 1 ml of tagged RBC suspension diluted
with water to 100 ml. Place the Whole Blood Standard into the well. Press the ENTER key to
begin counting.

14 - 10 BLOOD TESTS September 07

CAPINTEC, INC. CAPRAC®-R

When the Whole Blood Standard measurement is complete, press the © arrow key to accept
the measurement or the ª arrow key to repeat the measurement.

After accepting the Whole Blood Standard measurement, Figure 14-24 Measure RBC
Volume Plasma Standard will appear.

RBC VOLUME

MEASURE PLASMA
STANDARD

ENTER to Continue

Figure 14-24 Measure RBC Volume Plasma Standard

The Plasma Standard is made from 1 ml of the plasma from the centrifuged tagged RBC
suspension diluted with water to 100 ml. Place the Plasma Standard into the well. Press the
ENTER key to begin counting.
When the Plasma Standard measurement is complete, press the © arrow key to accept the
measurement or the ª arrow key to repeat the measurement.

After accepting the Plasma Standard measurement, Figure 14-25 Measure Whole Blood
Sample will appear.

RBC VOLUME

MEASURE WHOLE
BLOOD SAMPLE

ENTER to Continue

Figure 14-25 Measure Whole Blood Sample

The whole blood sample is made from blood withdrawn from the patient 10-20 minutes post
injection. Place the Whole Blood sample into the well. Press the ‘ENTER’ key to begin
counting.
When the Whole Blood Sample measurement is complete, press the © arrow key to accept
the measurement or the ª arrow key to repeat the measurement.

September 07 BLOOD TESTS 14 - 11

CAPINTEC, INC. CAPRAC®-R

After accepting the Whole Blood Sample measurement, Figure 14-26 Measure Plasma
Sample will appear.

RBC VOLUME

MEASURE
PLASMA SAMPLE

ENTER to Continue

Figure 14-26 Measure Plasma Sample

The Plasma Sample is made from the blood withdrawn 10-20 minutes post injection. Place
the Plasma Sample into the well. Press the ENTER key to begin counting.

When the Plasma Sample measurement is complete, press the © arrow key to accept the
measurement or the ª arrow key to repeat the measurement.

RBC Volume Calculations
After accepting the Plasma Sample measurement, the results screens will appear.

The results that are displayed on the five consecutive screens and the paper printout (if a
printer is attached to the system) are calculated as follows:

A = Hematocrit of Tagged RBC Suspension
B = Net Whole Blood Standard Count
C = Net Plasma Standard Count
D = Net Patient Whole Blood Sample Count
E = Patient Hematocrit
F = Net Patient Plasma Sample Count

Red Cell Volume (ml) = 1000 × [B - C(1- A)]E
- F(1- E)
D

Whole Blood Volume (ml) = Red Cell Volume (ml)
Patient Hematocrit

Plasma Volume (ml) = Whole Blood Volume (ml) - Red Cell Volume (ml)

14 - 12 BLOOD TESTS September 07

CAPINTEC, INC. CAPRAC®-R

RBC Volume Results 14 - 13

BKG :50.00 cpm
WHOLE BLOOD
STAND:xx.xx cpm
SAMPL:xx.xx cpm

ENTER to Continue

Figure 14-27 RBC Volume Results Screen #1

BKG :50.00 cpm
PLASMA
STAND:xx.xx cpm
SAMPL:xx.xx cpm

ENTER to Continue

Figure 14-28 RBC Volume Results Screen #2

PLASMA VOLUME
XXXX. ml
xx. ml/kg

ENTER to Continue

Figure 14-29 RBC Volume Results Screen #3

BLOOD VOLUME
XXXX. ml
xx. ml/kg

ENTER to Continue

Figure 14-30 RBC Volume Results Screen #4

September 07 BLOOD TESTS

CAPINTEC, INC. CAPRAC®-R

RBC VOLUME
XXXX. ml
xx. ml/kg

ENTER to Continue

Figure 14-31 RBC Volume Results Screen #5

14 - 14 BLOOD TESTS September 07

CAPINTEC, INC. CAPRAC®-R

CHAPTER 15

SCHILLING TEST

GENERAL

The Schilling Test is a test of urinary excretion to measure the absorption of B12 in patients
with unexplained anemia.

The CAPRAC®-R software assumes the following:
• An aliquot from the total urine volume collected over the testing period (e.g. 24 hours)
has been prepared for counting, and
• A Co-57 standard having the identical volume and geometry as the urine sample has
been prepared for counting.

To access the Schilling Test, press the WIPE and UTIL keys to display Figure 15-1 Main
Utility Menu.

f COUNT
TESTS
SETUP
DIAGNOSTICS

µ or ¶ to change
ENTER to select

Figure 15-1 Main Utility Menu

Use the ª arrow key to select TESTS. Press the ENTER key. The Tests Menu will appear as
shown in Figure 15-2 Tests Menu.

f DAILY
BLOOD TESTS
SCHILLING TEST
MDA TEST

µ or ¶ to change
ENTER to select

Figure 15-2 Tests Menu

September 07 SCHILLING TEST 15 - 1

CAPINTEC, INC. CAPRAC®-R

Use the ª arrow key to select SCHILLING TEST. Press the ENTER key. Figure 15-3
Schilling Test Dilution Factor Screen will appear.

SCHILLING TEST
DILUTION FACTOR

100.0

µ ¶ ´ to change
ENTER to accept

Figure 15-3 Schilling Test Dilution Factor Screen

The Dilution Factor is the ratio of activity of the Co57 capsule to the Co57 standard. When
using a 1% standard, the Dilution Factor equals 100.

Note: If the user is preparing the Co57 standard in-house, 1% dilution is equal to 1 ml
removed from a standard with a total volume of 100 ml. Adding water to the 1 ml
standard sample to bring the volume equal to that of the urine sample (e.g. 4 ml) will
not change the dilution factor. However, if 4 ml is removed from a 100 ml standard,
the dilution factor would be 25%.

Use the © or ª and ¨ arrow keys to enter the dilution factor. When the correct dilution factor
is displayed, press the ENTER key. Figure 15-4 Schilling Test Aliquot Volume will appear.

SCHILLING TEST
ALIQUOT VOLUME

2.0 ml

µ ¶ ´ to change
ENTER to accept

Figure 15-4 Schilling Test Aliquot Volume

The Aliquot Volume is the volume of urine taken from the total urine volume collected over
the testing period (e.g. 2 ml from a 2000 ml collection).

Use the © or ª and ¨ arrow keys to enter the volume taken from the total urine volume
collected. When the correct volume is displayed, press the ENTER key. Figure 15-5
Schilling Test Urine Volume will appear.

15 - 2 SCHILLING TEST September 07

CAPINTEC, INC. CAPRAC®-R

SCHILLING TEST
URINE VOLUME

2000.0 ml

µ ¶ ´ to change
ENTER to accept

Figure 15-5 Schilling Test Urine Volume

The Urine Volume is the total urine volume collected over the testing period (e.g. 2000 ml).

Use the © or ª and ¨ arrow keys to enter the total urine volume collected over the testing
period. When the correct volume is displayed, press the ENTER key.

Note: To avoid a geometric counting error, the sample volumes, sample containers and
placement of samples in the well must be the same. Any variations in these
parameters will require that an appropriate correction factor be applied to the final
calculations.

BACKGROUND COUNT

Once the sample volumes and patient data have been entered, the test begins with a
background count as shown in Figure 15-6 Prompt to Measure Room Background.

SCHILLING TEST

MEASURE ROOM
BACKGROUND

ENTER to Continue

Figure 15-6 Prompt to Measure Room Background

Verify that no sources are in the area and press the ENTER key to continue. Figure 15-7
Measure Schilling Test Background will appear.

September 07 SCHILLING TEST 15 - 3

CAPINTEC, INC. CAPRAC®-R

BKG 20s

µ or ¶ to change
COUNT to Start

Figure 15-7 Measure Schilling Test Background

Shading indicates the active portion of the display. Use the © or ª arrow keys to set the
number of seconds for the Test procedure. The five choices for counting are 20, 60, 180, 600
and 1800 seconds.
Note: The counting period is set for all sample counts. Once the counting period has been

accepted, it cannot be changed during the test.
When the correct time is displayed, press the COUNT key.
Pressing the COUNT(START/STOP) key at any time during the measurement will abort the
measurement and return to Figure 15-6 Prompt to Measure Room Background.
When the Background measurement is complete, press the © arrow key to accept the
measurement or the ª arrow key to repeat the measurement.

SAMPLE COUNTS

After accepting the Background measurement, Figure 15-8 Measure Schilling Test Standard
will appear.

SCHILLING TEST

MEASURE
STANDARD

ENTER to Continue

Figure 15-8 Measure Schilling Test Standard

Place the Co57 Standard into the well. Press the ENTER key to begin counting.

15 - 4 SCHILLING TEST September 07

CAPINTEC, INC. CAPRAC®-R

When the Co57 Standard measurement is complete, press the © arrow key to accept the
measurement or the ª arrow key to repeat the measurement.

After accepting the Co57 Standard measurement, Figure 15-9 Measure Schilling Test
Sample will appear.

SCHILLING TEST

MEASURE SAMPLE

ENTER to Continue

Figure 15-9 Measure Schilling Test Sample

Place the Urine Sample into the well. Press the ENTER key to begin counting.
When the Urine Sample measurement is complete, press the © arrow key to accept the
measurement or the ª arrow key to repeat the measurement.

SCHILLING TEST CALCULATIONS

After accepting the Urine sample measurement, the results screens will appear.

The results that are displayed on the two consecutive screens and the paper printout (if a
printer is attached to the system) are calculated as follows:

U = Urine Count rate
B = Room Background
V = Urine Volume
S = Standard count rate
D = Dilution Factor
A = Aliquot Volume

The percent excretion equals:

% excretion = 100 × (S U-B D × V
A
- B)×

September 07 SCHILLING TEST 15 - 5

CAPINTEC, INC. CAPRAC®-R

SCHILLING TEST RESULTS

DF :100.0
ALIQUOT:2.0 ml
URINE :2000.ml

ENTER to Continue

Figure 15-10 Test Results Screen #1

BKG :60.53 cpm
STAND:535.1kcpm
BLOOD:6299. cpm
EXCRETION:

11.7 %

ENTER to Continue

Figure 15-11 TEST Results Screen #2

15 - 6 SCHILLING TEST September 07

CAPINTEC, INC. CAPRAC®-R

CHAPTER 16

MDA TEST

MINIMUM DETECTABLE ACTIVITY (MDA)

Regulatory guidelines may require instruments that are used to measure wipe samples for
radioactive contamination be evaluated to determine the minimum level of activity that can be
detected by that instrument.

The minimum detectable activity (MDA) is dependent on the background levels where the
instrument is located and the counting time used to assess the background rate.

Because these variables are user-dependent, it is not possible for Capintec to publish an
MDA for the CAPRAC-R. Capintec recommends that users determine the appropriate
counting time based on the required MDA limit for their application as well as the ambient
background rates where the instrument is located.

The CAPRAC-R includes a test that will provide MDA values for a specific nuclide selected
by the user. The test measures the background in the channels (ROI) that would be used to
measure the activity of the selected nuclide and calculates the MDA for that nuclide.

The measurement is performed with no isotope placed in the Well Counter.

The user must also select the counting time and the precision (standard deviations) used in
the calculation.

To perform an MDA Test, press the WIPE and UTIL keys to display Figure 16-1 Main Utility
Menu.

f COUNT
TESTS
SETUP
DIAGNOSTICS

µ or ¶ to change
ENTER to select

Figure 16-1 Main Utility Menu

Use the ª arrow key to select TESTS. Press the ENTER key. The Tests Menu will appear as
shown in Figure 16-2 Tests Menu.

January 08 MDA TEST 16 - 1

CAPINTEC, INC. CAPRAC®-R

f DAILY
BLOOD TESTS

SCHILLING TEST

MDA TEST

µ or ¶ to change
ENTER to select

Figure 16-2 Tests Menu

Use the ª arrow key to select MDA TEST. Press the ENTER key. Figure 16-3 Nuclides with
Conversion Factors List will appear.

f TC99m IN111
I 131 CO57
I 123 CR51
GA67 NA22
TL201 MN54

Figure 16-3 Nuclides with Conversion Factors List

The first 10 nuclides with Conversion Factor data entered in the system are displayed. Use
the ª arrow key to proceed to the next screen.

Note: The list of nuclides displayed shows only those that have Conversion Factor data
entered into the system. If the nuclide of interest does not have Conversion Factor
data entered into the system, it will not be displayed. Refer to CHAPTER 6:
CONVERSION FACTORS FOR NUCLIDES for information on entering Conversion
Factor data.

Tc99m is the default nuclide.

To select another nuclide for the test, use the ¨ arrow key to de-select Tc99m. Use the © or
ª arrow keys to point to the desired nuclide then use the ¨ arrow key to select (highlight)
the radionuclide. The cursor will automatically move to the next nuclide.

If a radionuclide has been selected by mistake, move the cursor to the radionuclide and use
the ¨ arrow key to erase the shading. When the correct nuclide has been selected, press the
ENTER key. Figure 16-4 Precision Screen will appear.

16 - 2 MDA TEST January 08

CAPINTEC, INC. CAPRAC®-R

PRECISION

3

µ ¶ ´ to change
ENTER to accept

Figure 16-4 Precision Screen

The precision must be set. The default precision is 3.
Note: The allowable range is 1-9 standard deviations.
If the displayed value is OK, press ENTER. Figure 16-5 Prompt to Measure Screen will
appear.
If the displayed value is not OK, use the © or ª arrow keys to change the Precision. When
the correct Precision is displayed, press the ENTER key. Figure 16-5 Prompt to Measure
Screen will appear.

MDA TEST

REMOVE
SOURCES

ENTER to Continue

Figure 16-5 Prompt to Measure Screen

Remove all sources from the vicinity of the Well Counter and press the ENTER key to
continue. Figure 16-6 Measure MDA will appear.

MDA 20s

January 08 µ or ¶ to change 16 - 3
COUNT to Start

Figure 16-6 Measure MDA

MDA TEST

CAPINTEC, INC. CAPRAC®-R

The measurement time must now be set. Shading indicates the active portion of the display.
Use the © or ª arrow keys to set the number of seconds for the MDA Test procedure. The
five choices for counting are 20, 60, 180, 600 and 1800 seconds.

The recommended counting time is 600 seconds. When the correct time is displayed, press
the COUNT key.

Pressing the COUNT(START/STOP) key at any time during the measurement will abort the
measurement and return to Figure 16-2 Tests Menu.

MDA TEST RESULTS

When the counting is finished, a shaded bar graph will be briefly displayed and then Figure
16-7 Test Results Screen will appear.

If a printer is attached to the system, a report of the measurement will be printed showing the
selected nuclide, MDA, the selected precision, counts, selected counting time and a bar
graph with the channels used in the calculation shaded solid.

MDA
FOR TC99m

78.7dpm

ENTER to Continue

Figure 16-7 Test Results Screen

Press ENTER to continue. Figure 16-2 Tests Menu will re-appear.

Example printouts are shown in Figure 16-8 MDA Test Results (Curie) Printout and Figure
16-9 MDA Test Results (Becquerel) Printout

16 - 4 MDA TEST January 08


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