CAPINTEC, INC. CRC
®
-25R
If a printer is attached to the system, the test results will automatically be printed at the end
of all source measurements.
Note: Accuracy test requires a dedicated check source of known activity which is measured
on a daily basis. This test provides both an accuracy value as well as a long term
reproducibility check of the instrument.
Note: There is no need to perform a constancy test on alternate calibration (nuclide)
settings. This provides no value in terms of instrument operation. However, due to
numerous procedures which reference this test, operators who prefer to include this
test should refer to CHAPTER 8: BACKGROUND AND TESTS.
Contamination Test
This tests the Dipper and/or Liner for contamination and is normally performed at the end of
each workday. At the very least, it should be performed once per week. To perform a
contamination test:
1. Make sure that the dipper is in the Chamber and there is no source in the dipper.
2. From the Chamber Measurement screen, press NUCL and input 2657 for Co57 and
press ENTER.
3. Press the DOWN ARROW (
).
4. Record the displayed activity.
5. Remove the dipper from the Chamber and record the displayed activity.
6. Subtract the activity in step 5 from the activity in step 4. This is the amount of
contamination of the dipper.
7. Remove the liner from the Chamber and record the displayed activity.
8. Subtract the activity in step 7 from the activity in step 5. This is the amount of
contamination of the liner.
9. Should either the dipper or the liner exhibit contamination greater than 3 µCi or 0.1
MBq, they should be decontaminated or replaced.
10. Return the liner to the Chamber.
CAUTION: Never use the calibrator without the Chamber liner in place. Liners are
inexpensive and easy to replace. A contaminated Chamber is a very
March 15 ACCEPTANCE & QUALITY ASSURANCE TESTS 7 - 3
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