10 CFR §35.2642

1. (a)A licensee shall retain a record of each periodic spot-check for teletherapy units required by § 35.642 for 3 years.
2. (b)The record must include—
   1. (1)The date of the spot-check;
   2. (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. (3)An assessment of timer linearity and constancy;
   4. (4)The calculated on-off error;
   5. (5)A determination of the coincidence of the radiation field and the field indicated by the light beam localizing device;
   6. (6)The determined accuracy of each distance measuring and localization device;
   7. (7)The difference between the anticipated output and the measured output;
   8. (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. (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.
3. (c)A licensee shall retain a copy of the procedures required by § 35.642(b) until the licensee no longer possesses the teletherapy unit.