§ 175.66 Therapeutic Radiation Machines; Calibration of Survey Instruments.
RCNY § 175.66
(a)The registrant must ensure that the survey instruments used to show compliance with this Article have been calibrated before first use, and annually thereafter, and following repair.
(b)To satisfy the requirements of subdivision (a) of this section, the registrant must: (1) calibrate all required scale readings up to 10 mSv (1,000 mrem) per hour with an appropriate radiation source that is traceable to the National Institute of Standards and Technology (NIST); (2) calibrate at least 2 points on each scale to be calibrated. These points should be at approximately 1/3 and 2/3 of full-scale.
(c)To satisfy the requirements of subdivision (b) of this section., the registrant must: (1) consider a point as calibrated if the indicated dose rate differs from the calculated dose rate by not more than 10 percent; and (2) 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.
(d)The registrant must retain a record of each calibration required by subdivision (a) of this section for 3 years. The record must include: (1) a description of the calibration procedure; and (2) 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.
(e)The registrant may obtain the services of individuals licensed by the Department, the US Nuclear Regulatory Commission or an Agreement State to perform calibrations of survey instruments. The registrant must maintain records of calibrations that contain information required by subdivision (d) of this section. (Added City Record 4/24/2019, eff. 5/24/2019)
