Minn. R. 4731.4260
UTILIZATION LOGS
Subpart 1. Logs required. A licensee must maintain utilization logs showing for each sealed source: A. a description, including the make, model, and serial number, of the radiographic exposure device or transport or storage container in which the sealed source is located; B. the identity and signature of the radiographer to whom assigned; and C. the plant or site where used and dates of use, including the dates removed and returned to storage. Subp. 2. Retention. A licensee must retain the logs required under subpart 1 for three years after the log is made.