---
kind: "section"
citation: "10 C.F.R. § 35.70"
title: "10"
number: "35.70"
heading: "Surveys of ambient radiation exposure rate."
url: "https://uscodex.org/cfr/10/35.70"
---

# §35.70. Surveys of ambient radiation exposure rate.

- (a) In addition to the surveys required by [Part 20](/cfr/10/part20.md) of this chapter, a licensee shall survey with a radiation detection survey instrument at the end of each day of use. A licensee shall survey all areas where unsealed byproduct material requiring a written directive was prepared for use or administered.
- (b) A licensee does not need to perform the surveys required by [paragraph (a)](#a) of this section in an area(s) where patients or human research subjects are confined when they cannot be released under [§ 35.75](/cfr/10/35.75.md).
- (c) A licensee shall retain a record of each survey in accordance with [§ 35.2070](/cfr/10/35.2070.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.