To ensure correct response to radiation, each radiation survey instrument must be calibrated at intervals not to exceed 24 months and after each servicing:
be calibrated at energy levels and over a range appropriate for the use;
be calibrated to accuracy within plus or minus 20 percent over the applicable range of the instrument;
the calibration of any electronic equipment must be traceable to its calibration standard at the National Institute of Standards and Technology (NIST); and
noninvasive kVp meters must be calibrated by the manufacturer or an accredited calibration laboratory.
MS s 144.12
32 SR 777
December 10, 2007