Question 48: In 10 CFR 20.1301 (a) (2), does ". . . 0.002
rem (0.02 mSv) in any one hour" apply to the dose in any
single hour or can it apply to the average over a discrete
period of time.
Answer: The phrase "0.002 rem in any one hour" means a
cumulative dose of 0.002 rem in any period of 60
consecutive minutes regardless of the dose rates within
that 60-min. period. It does not mean a dose rate, in
units of rems per hour, obtained by averaging over a time
period greater than, or less than, one hour. (Reference:
10 CFR 20.1301 (a) (2))