Question 117: Does the requirement of 10 CFR 20.2101 (a)
to use the unit curie (for activity) mean that it will not
be permissible to record the results of contamination
surveys in units of disintegrations per minute (dpm) or
mrad smearable?
Answer: No. The 10 CFR 20.2101 (a) requirement as it
applies to units of activity (curies) is intended to apply
to records of quantities of material directly related to
the explicit requirements of Part 20 (e.g., storage and
control, posting and labeling, waste disposal,
concentrations in air, and individual intakes of
radioactive material). It is not intended to apply to
surveys for contamination. Note: There are requirements
in 10 CFR 35.70 (h) which apply to medical licensees to
record the results of surveys for removable contamination
as disintegrations per minute per 100 square centimeters.
(Reference: 10 CFR 20.2101)