§ 35.2642 - Records of periodic spot-checks for teletherapy units.

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A licensee shall retain a record of each periodic spot-check for teletherapy units required by § 35.642 for 3 years.

The record must include—

The date of the spot-check;

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;

An assessment of timer linearity and constancy;

The calculated on-off error;

A determination of the coincidence of the radiation field and the field indicated by the light beam localizing device;

The determined accuracy of each distance measuring and localization device;

The difference between the anticipated output and the measured output;

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

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.

A licensee shall retain a copy of the procedures required by § 35.642(b) until the licensee no longer possesses the teletherapy unit.