Calibration of Survey Instruments

Section 340.540  Calibration of Survey Instruments a)         Unless specified in another Part, a licensee shall have each survey instrument used to show compliance with this Part calibrated 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.