10 C.F.R. § 34.83
Records of personnel monitoring procedures
Each licensee shall maintain the following exposure records specified in § 34.47:
(a) Direct reading dosimeter readings and yearly operability checks required by § 34.47 (b) and (c) for 3 years after the record is made.
(b) Records of alarm ratemeter calibrations for 3 years after the record is made.
(c) Personnel dosimeter results until the Commission terminates the license.
(d) Records of estimates of exposures as a result of: off-scale personal direct reading dosimeters, or lost or damaged personnel dosimeters until the Commission terminates the license.