Section 144-220-G-L-2642 - Records of periodic spot-checks for teletherapy unitsA. A licensee shall retain a record of each periodic spot-check for teletherapy units required by G.642 for three years.B. The record must include: (1) The date of the spot-check;(2) The manufacturer's name, model number, and serial number of the teletherapy unit, source, and instrument used to measure the output of the teletherapy unit;(3) An assessment of timer linearity and constancy;(4) The calculated on-off error;(5) A determination of the coincidence of the radiation field and the field indicated by the light beam localizing device;(6) The determined accuracy of each distance measuring and localization device; (7) The difference between the anticipated output and the measured output;(8) Notations indicating the operability of each entrance door electrical interlock, each electrical or mechanical stop, each source exposure indicator light, and the viewing and intercom system and doors; and(9) The name of the individual who performed the periodic spot-check and the signature of the authorized medical physicist who reviewed the record of the spot-check.C. A licensee shall retain a copy of the procedures required by G.642.B until the licensee no longer possesses the teletherapy unit.10-144 C.M.R. ch. 220, § G-L-2642