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Oklahoma Administrative Code (Last Updated: March 11, 2021) |
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TITLE 252. Department of Environmental Quality |
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Chapter 410. Radiation Management |
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Subchapter 11. Use of X-Rays and /or Particles for Therapeutic Purposes in the Healing Arts and Veterinary Medicine |
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Part 7. RADIATION SAFETY MANAGEMENT |
SECTION 252:410-11-73. Calibrations of <1 MeV systems
Latest version.
- (a) Frequency. The calibration of a <1 MeV system shall be performed at intervals not to exceed one (1) year and after any change or replacement of components which could cause a change in the radiation output.(b) Dosimetry system. The calibration of the radiation output of <1 MeV systems shall be performed with a dosimetry system that has been calibrated within the preceding two (2) years with calibration that is traceable to a national standard.(c) Performance. The therapy system calibration shall be performed by or under the direction of a qualified expert.(d) Precision. Calibrations must be in sufficient detail so that the dose at a reference point in water or plastic phantom can be calculated to within an uncertainty of 5 percent.(e) Outcome. Calibrations must include, but are not be limited to, the following determinations:(1) verification that the system is operating in compliance with the design specifications;(2) half-value layer for each kV setting and filter combination used;(3) exposure rates as a function of field size, technique factors, filter, and treatment distance used; and(4) the degree of congruence between the radiation field and the field indicated by the localizing device if such device is present which shall be within 5 millimeters for any field edge.