Section 35.2652 - Records of surveys of therapeutic treatment units(a) A licensee shall maintain a record of radiation surveys of treatment units made in accordance with § 35.652 for the duration of use of the unit.(b) The record must include- (1) The date of the measurements;(2) The manufacturer's name, model number and serial number of the treatment unit, source, and instrument used to measure radiation levels;(3) Each dose rate measured around the source while the unit is in the off position and the average of all measurements; and(4) The signature of the individual who performed the test.