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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 43

Question 43: The licensee initially was required to monitor internal dose. The results indicate that monitoring is not required, i.e., levels are positive but less than 10% of the allowable limits. Can the measured internal dose values be ignored? If yes, will the licensee be in noncompliance if it sums internal and external doses?

Answer: The licensee was required to monitor internal dose [because the licensee had made a prospective determination that the individual (s) was (were) "likely to receive" an intake in excess of 10% of the limits]. The internal dose values cannot be ignored regardless of the fact that they are less than 10% of the limits. If the licensee was not required to monitor internal dose because the licensee had made a prospective determination that the doses likely would be less than 10% of the limits but elected to monitor internal dose anyway, the licensee could choose to "ignore" the measured values that are less than 10% or to add those values to the external doses to obtain the sum of the internal and external doses. Nothing in Part 20 prohibits the licensee from monitoring or summing internal doses at less than 10% of the limits; therefore, a licensee can never be in noncompliance for summing the internal and external doses.

(Reference: 10 CFR 20.1502)

Page Last Reviewed/Updated Tuesday, December 12, 2017

Page Last Reviewed/Updated Tuesday, December 12, 2017