Oregon Oregon Health Authority, Public Health Division

Rule Rule 333-105-0450
Equipment Control: Radiation Survey Instruments


The licensee must keep sufficient calibrated and operable radiation survey instruments at each location where sources of radiation are present to make the radiation surveys required by this division and by division 120 of these rules. Instrumentation required by this section must be capable of measuring a range from 0.02 millisieverts (2 mrem) per hour through 0.01 sievert (1 rem) per hour.


The licensee must have each radiation survey instrument required under section (1) of this rule calibrated:


At energies appropriate for use and at intervals not to exceed six months or after instrument servicing, except for battery changes;


For linear scale instruments, at two points located approximately one-third and two-thirds of full-scale on each scale; for logarithmic scale instruments, at mid-range of each decade, and at two points of at least one decade; and for digital instruments, at three points between 0.02 and ten millisieverts (2 and 1000 mrem) per hour; and


So that an accuracy within plus or minus 20 percent of the true radiation dose rate can be demonstrated at each point checked.


The licensee must maintain records of the results of the instrument calibrations in accordance with 333-105-0620 (Records of Radiation Survey Instruments).

Last accessed
Jun. 8, 2021