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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 252:410-11-76. Spot-checks
Latest version.
- (a) Required. Spot-checks must be performed on therapeutic systems which are capable of operation at greater than 150 kVp.(b) Procedure. Written spot-check procedures must be developed by a radiological physicist which:(1) state the frequency at which tests or measurements are to be performed;(2) set the acceptable tolerance for each parameter measured in the spot-check when compared to the value for that parameter determined in the calibration;(3) include special operating instructions to be used when a parameter measured in the spot-check exceeds an acceptable tolerance level of the value for that parameter which was determined in the calibration.(4) require that spot-checks be performed during calibration.(c) Performance and review. Each spot-check must be performed by or under the direction of a radiological physicist according to the written spot-check procedures. When a spot-check is performed by someone other than a radiological physicist, the physicist must review the resulting measurements and record his review. The review must occur within ten (10) treatment days.(d) Additional frequency requirements. Systems of 1 MeV or more must have:(1) spot-checks performed during calibrations and thereafter at intervals not to exceed one month;(2) a spot-check of system output performed each day before any patient is treated; and(3) a spot-check of absorbed dose measurements taken at a minimum of two (2) depths in a phantom at intervals not to exceed one (1) month.(e) Measurements. A spot-check record must state the acceptable tolerance for each parameter measured in the spot-check when compared to the value for that parameter determined in the calibration.(1) Whenever a spot-check indicates a significant change in the operating characteristics of a system, as specified in the spot-check procedures, the system must be recalibrated.(2) When a spot-check involves a radiation measurement, such measurement shall be obtained using a system satisfying the requirements of 252:410-11-73(b) or which has been intercompared with a system meeting those requirements within the previous year.(f) Measurement restriction. For systems of 1 MeV or more, any built-in devices which provide a measurement of any parameter during irradiation cannot be utilized for spot-check measurements.