Capintec CRC-712MX, Руководство пользователя

Страница: 33 / 68

CAPINTEC, INC. CRC
®
-712MX
Test with a Reference Source
It is recommended to use a source that has a long half-life such as Cs137
(approximately 100µCi [3.7MBq]) sealed in a plastic vial.
Always use the same Reference Source (i.e., Bench-mark Source).
1. Measure the activity of the Reference Source using the proper calibration
setting and record the reading.
2. With the Reference Source in the calibrator well, press the eight preset
isotope select buttons one by one and record the reading for each.
3. Press the OTHER push-button, set the Calibration Control to 112 and record
the reading.
4. Set the Calibration Control to 990 and record the reading.
5. Similarly record the readings at all of the calibration settings of any
radioisotopes, which are anticipated to be measured in the near future.
All readings should be consistent with previous readings to within ±2%. If a Cs137
Source is used as a Reference, the reading will decrease by 0.2% per month.
Quarterly Tests
The Quarterly Tests consist of:
•
Daily Test
•
Checking Preset Calibration
•
Well Liner Contamination
•
Linearity Test
Daily Tests
The normal Daily Tests as described above should be performed as a part of the
Quarterly Tests.
Checking Preset Calibration
Any of the eight preset calibration numbers may be checked by the following
procedure:
1. Verify that the Zero and Background Adjustments are within specifications.
2. Press the isotope push-button to be checked.
3. Insert a radioisotope of substantial activity (100µCi [3.7MBq] or higher) into
the chamber well.
4. Record the displayed reading, including the decimal point and units.
5. Press the OTHER push-button.
6. Adjust the Calibration Control until the displayed reading coincides with the
reading noted in Step 4.
January 08 QUALITY ASSURANCE & ACCEPTANCE TESTING 5 - 3