Can anyone give me some insight (and possible source documents) into the reasons for the 100cm^2 standard (or suggestion?) used for removable contamination surveys? Why is it 100cm^2 and not 1,000cm^2, or something smaller or larger? Is there anything wrong with increasing the swiped area to increasing the likelihood of detection?
Specifically, assume a removable contamination limit is set at 200 dpm/100cm^2 for a laboratory and a researcher wishes to use a survey meter to count the swipes. According to the manufacturer's formula and values (for efficiency of the radionuclide, etc), the meter has an MDA of 400 dpm. Is there anything wrong with performing the survey over 200 cm^2 so that the detection limit would meet the removable contamination limit?
Thanks,
Pete Jenkins
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