Section 120.361 - Records of Receipt, Transfer, and Disposal of Sources of Radiation(A) Each licensee or registrant shall maintain records showing the receipts, transfers and disposal of sealed sources, devices using DU for shielding, and radiation machines, and retain each record for five years after it is made.(B) These records must include the date, the name of the individual making the record, radionuclide, number of becquerels (curies) or mass (for DU), and manufacturer, model, and serial number of each source of radiation and/or device, as appropriate.