Okla. Admin. Code § 252:410-11-73

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

Section 252:410-11-73 - Calibrations of <1 MeV systems

(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.

Okla. Admin. Code § 252:410-11-73

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