Calibration of survey instruments.

10 C.F.R. § 35.61
in effectEffective: 2024-07-01
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(a) A licensee shall calibrate the survey instruments used to show compliance with this part and 10 CFR Part 20 before first use, annually, and following a repair that affects the calibration. A licensee shall— (1) Calibrate all scales with readings up to 10 mSv (1000 mrem) per hour with a radiation source; (2) Calibrate two separated readings on each scale or decade that will be used to show compliance; and (3) Conspicuously note on the instrument the date of calibration. (b) A licensee may not use survey instruments if the difference between the indicated exposure rate and the calculated exposure rate is more than 20 percent. (c) A licensee shall retain a record of each survey instrument calibration in accordance with § 35.2061.

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