---
kind: "section"
citation: "10 C.F.R. § 35.647"
title: "10"
number: "35.647"
heading: "Additional technical requirements for mobile remote afterloader units."
url: "https://uscodex.org/cfr/10/35.647"
---

# §35.647. Additional technical requirements for mobile remote afterloader units.

- (a) **A licensee providing mobile remote afterloader service shall—**
  - (1) Check survey instruments before medical use at each address of use or on each day of use, whichever is more frequent; and
  - (2) **Account for all sources before departure from a client's address of use.**
- (b) In addition to the periodic spot-checks required by [§ 35.643](/cfr/10/35.643.md), a licensee authorized to use mobile afterloaders for medical use shall perform checks on each remote afterloader unit before use at each address of use. At a minimum, checks must be made to verify the operation of—
  - (1) Electrical interlocks on treatment area access points;
  - (2) Source exposure indicator lights on the remote afterloader unit, on the control console, and in the facility;
  - (3) Viewing and intercom systems;
  - (4) Applicators, source transfer tubes, and transfer tube-applicator interfaces;
  - (5) Radiation monitors used to indicate room exposures;
  - (6) Source positioning (accuracy); and
  - (7) **Radiation monitors used to indicate whether the source has returned to a safe shielded position.**
- (c) In addition to the requirements for checks in [paragraph (b)](#b) of this section, a licensee shall ensure overall proper operation of the remote afterloader unit by conducting a simulated cycle of treatment before use at each address of use.
- (d) If the results of the checks required in [paragraph (b)](#b) of this section indicate the malfunction of any system, a licensee shall lock the control console in the off position and not use the unit except as may be necessary to repair, replace, or check the malfunctioning system.
- (e) A licensee shall retain a record of each check required by [paragraph (b)](#b) of this section in accordance with [§ 35.2647](/cfr/10/35.2647.md).

## 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.