Alert

Due to a lapse in appropriations, the NRC has ceased normal operations. However, excepted and exempted activities necessary to maintain critical health and safety functions—as well as essential progress on designated critical activities, including those specified in Executive Order 14300—will continue, consistent with the OMB-Approved NRC Lapse Plan.

Health Physics Questions and Answers - Question 48

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))

Page Last Reviewed/Updated Tuesday, December 12, 2017