Calibration and Check of Survey Instruments

Calibration and Check of Survey Instruments. 1. A registrant shall ensure that the survey instruments used to show compliance with this Subchapter have been calibrated before first use, annually, and following repair. 2. To satisfy the requirements of 1.15.8(1), the registrant shall: a. Calibrate all required scale readings up to 1000 mrem (10 mSv) per hour with an appropriate radiation source; b. Calibrate at least two points on each scale to be calibrated. These points should be at approximately 1/3 and 2/3 of scale rating; and c. Conspicuously note on the instrument the apparent dose rate from a dedicated check source as determined at the time of calibration, and the date of calibration. 3. To satisfy the requirements of 1.15.8(2), the registrant shall: a. Consider a point as calibrated if the indicated dose rate differs from the calculated dose rate by not more than 10 percent; and b. Consider a point as calibrated if the indicated dose rate differs from the calculated dose rate by not more than 20 percent if a correction factor or graph is conspicuously attached to the instrument. 4. A registrant shall check each survey instrument for proper operation with the dedicated check source each day of use. The registrant is not required to keep records of these checks. 5. The registrant shall retain a record of each calibration required in 1.15.8(1) for 3 years. The record shall include: a. A description of the calibration procedure; and b. A description of the source used and the certified dose rates from the source, and the rates indicated by the instrument being calibrated, the correction factors deduced from the calibration data, the signature of the individual who performed the calibration, and the date of calibration. 6. The registrant may obtain the services of individuals licensed by the Agency, the U.S. Nuclear Regulatory Commission, an Agreement State, or a Licensing State to perform calibrations of survey instruments. Records of calibrations which contain information required by 1.15.8(5) shall be maintained by the registrant.