---
kind: "section"
citation: "10 C.F.R. § 35.432"
title: "10"
number: "35.432"
heading: "Calibration measurements of brachytherapy sources."
url: "https://uscodex.org/cfr/10/35.432"
---

# §35.432. Calibration measurements of brachytherapy sources.

- (a) Before the first medical use of a brachytherapy source on or after October 24, 2002, a licensee shall have—
  - (1) Determined the source output or activity using a dosimetry system that meets the requirements of [§ 35.630(a)](/cfr/10/35.630.md?p=a);
  - (2) Determined source positioning accuracy within applicators; and
  - (3) Used published protocols currently accepted by nationally recognized bodies to meet the requirements of paragraphs [(a)(1)](#a-1) and [(a)(2)](#a-2) of this section.
- (b) Instead of a licensee making its own measurements as required in [paragraph (a)](#a) of this section, the licensee may use measurements provided by the source manufacturer or by a calibration laboratory accredited by the American Association of Physicists in Medicine that are made in accordance with [paragraph (a)](#a) of this section.
- (c) A licensee shall mathematically correct the outputs or activities determined in [paragraph (a)](#a) of this section for physical decay at intervals consistent with 1 percent physical decay.
- (d) A licensee shall retain a record of each calibration in accordance with [§ 35.2432](/cfr/10/35.2432.md).

## Notes

### Amendments

[67 FR 20370, Apr. 24, 2002, as amended at 68 FR 19325, Apr. 21, 2003]

### 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.

### Amendments

[67 FR 20370, Apr. 24, 2002, as amended at 68 FR 19325, Apr. 21, 2003]