---
kind: "section"
citation: "10 C.F.R. § 34.25"
title: "10"
number: "34.25"
heading: "Radiation survey instruments."
url: "https://uscodex.org/cfr/10/34.25"
---

# §34.25. Radiation survey instruments.

- (a) The licensee shall keep sufficient calibrated and operable radiation survey instruments at each location where radioactive material is present to make the radiation surveys required by this part and by [10 CFR part 20](/cfr/10/part20.md) of this chapter. Instrumentation required by this section must be capable of measuring a range from 0.02 millisieverts (2 millirems) per hour through 0.01 sievert (1 rem) per hour.
- (b) The licensee shall have each radiation survey instrument required under [paragraph (a)](#a) of this section calibrated—
  - (1) At intervals not to exceed 6 months and after instrument servicing, except for battery changes;
  - (2) For linear scale instruments, at two points located approximately one-third and two-thirds of full-scale on each scale; for logarithmic scale instruments, at mid-range of each decade, and at two points of at least one decade; and for digital instruments, at 3 points between 0.02 and 10 millisieverts (2 and 1000 millirems) per hour; and
  - (3) So that an accuracy within plus or minus 20 percent of the calibration source can be demonstrated at each point checked.
- (c) The licensee shall maintain records of the results of the instrument calibrations in accordance with [§ 34.65](/cfr/10/34.65.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: 62 FR 28963, May 28, 1997, unless otherwise noted.