Okla. Admin. Code § 252:410-11-76

Current through Vol. 41, No. 19, June 17, 2024

Section 252:410-11-76 - Spot-checks

(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.

Okla. Admin. Code § 252:410-11-76

Added at 17 Ok Reg 1136, eff 6-1-00