Appendix D Optimizing the CANBERRA iSERIES for Air Sample Counting
Step 5 – Verify Results
Go to step 1 and check if the peak falls into the correct channel range. Repeat steps 3
and 4 until the peak is in the correct location.
Radon Stripping Verification Tests
Sample activity results should be reviewed by a competent person to verify that the
algorithm is working correctly. There are many different experiments that can be
designed to determine that the radon compensation routine works properly.
1.
Zero Activity Time Series Test
Air samples taken with no expected activity are counted for 10 minutes with
multiple repeats to determine that the "true activity" of the sample is the same
when radon/thoron progeny are present as when the progeny has completely
decayed.
2.
Spiked Filter Time Series Test
Air samples taken with added activity are counted for 10 minutes with multiple
repeats to determine that the "true activity" of the sample is the same when
radon/thoron progeny are present as when the progeny has completely
decayed.
3.
Re-Sampled Hot Filter Test
Air samples taken using previously characterized contaminated filter samples
are counted for 10 minutes with multiple repeats to determine that the "true
activity" of the sample is the same when radon/thoron progeny are present as
when the progeny has completely decayed.
4.
Hayes Offset Filter Test
Air samples taken with no expected activity are punched with a known
standard placed in the whole prior to counting. The air filter/standard are
counted for 10 minutes with multiple repeats to determine that the "true
activity" of the sample is the same when radon/thoron progeny are present as
when the progeny has completely decayed.
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iMatic Automatic Counting System User's Manual - 9239221K
