---
kind: "section"
citation: "10 C.F.R. § 35.2642"
title: "10"
number: "35.2642"
heading: "Records of periodic spot-checks for teletherapy units."
url: "https://uscodex.org/cfr/10/35.2642"
---

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

- (a) A licensee shall retain a record of each periodic spot-check for teletherapy units required by [§ 35.642](/cfr/10/35.642.md) for 3 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 [§ 35.642(b)](/cfr/10/35.642.md?p=b) until the licensee no longer possesses the teletherapy unit.

## Notes

### Authority

Authority: Atomic Energy Act of 1954, secs. 81, 161, 181, 182, 183, 223, 234, 274 (42 U.S.C. 2111, 2201, 2231, 2232, 2233, 2273, 2282, 2021); Energy Reorganization Act of 1974, secs. 201, 206 (42 U.S.C. 5841, 5846); 44 U.S.C. 3504 note.

### Source

Source: 67 FR 20370, Apr. 24, 2002, unless otherwise noted.