United States Nuclear Regulatory Commission - Protecting People and the Environment

U.S. Nuclear Regulatory Commission

Question 372: When monitoring of internal exposure is

required by 10 CFR 20.1502, 10 CFR 20.1204 (a) requires the

licensee to take "suitable and timely" measurements. Will

NRC define what is suitable and timely to avoid differences

of opinion among inspectors?

Answer: No. Some general guidance on what is suitable and

timely will be included in Regulatory Guide 8.9, Rev. l,

"Acceptable Concepts, Models, Equations, and Assumptions

for a Bioassay Program." Other than this general guidance,

the NRC staff has no plans to provide a definition of what

is "suitable and timely." That definition depends on the

circumstances of the particular exposure. What is

"suitable and timely" under revised Part 20 is (as before,

under old Part 20) a matter of professional judgement in a

good radiation protection program. NRC management will

resolve any "differences of opinion among inspectors" that

are called to its attention. (References: 10 CFR 20.1204,

10 CFR 20.1502)

Page Last Reviewed/Updated Thursday, March 29, 2012