La. Admin. Code tit. 33 § XV-755

Current through Register Vol. 50, No. 9, September 20, 2024

Section XV-755 - Dosimetry Equipment and Therapy-Related Computer Systems

A. A licensee shall have a calibrated dosimetry system available for use. To satisfy this requirement, one of the following two conditions shall be met.

1. The system shall have been calibrated by the National Institute of Standards and Technology or by a calibration laboratory accredited by the American Association of Physicists in Medicine. The calibration shall have been performed within the previous two years and after any servicing that may have affected system calibration.

2. The system shall have been calibrated within the previous 4 years; 18 to 30 months after that calibration, the system shall have been intercompared at an intercomparison meeting with another dosimetry system that was calibrated within the past 24 months by the National Institute of Standards and Technology or by a calibration laboratory accredited by the American Association of Physicists in Medicine. The results of the intercomparison meeting shall have indicated that the calibration factor of the licensee's system had not changed by more than 2 percent. The licensee shall not use the intercomparison result to change the calibration factor. When intercomparing dosimetry systems to be used for calibrating sealed sources for therapeutic units, the licensee shall use a comparable unit with beam attenuators or collimators, as applicable, and sources of the same radionuclide as the source used at the licensee's facility.

B. The licensee shall have available for use a dosimetry system for spot-check measurements. To meet this requirement, the system may be compared with a system that has been calibrated in accordance with Subsection A of this Section. This comparison shall have been performed within the previous year and after each servicing that may have affected system calibration. The spot-check system may be the same system used to meet the requirement in Subsection A of this Section.

C. The licensee shall maintain a record of each calibration, intercomparison, and comparison for the duration of the license. For each calibration, intercomparison, or comparison, the record shall include:

1. the date;

2. the model numbers and serial numbers of the instruments that were calibrated, intercompared, or compared, as required by Subsections A and B of this Section;

3. the correction factors that were determined;

4. the names of the individuals who performed the calibration, intercomparison, or comparison; and

5. evidence that the intercomparison meeting was sanctioned by a calibration laboratory or radiologic physics center accredited by the American Association of Physicists in Medicine.

D. The licensee shall perform acceptance testing on the treatment planning system of a therapy-related computer system in accordance with published protocols accepted by nationally-recognized bodies. At a minimum, the acceptance testing shall include, as applicable, verification of:

1. the source-specific input parameters required by the dose calculation algorithm;

2. the accuracy of dose, dwell time, and treatment time calculations at representative points;

3. the accuracy of isodose plots and graphic displays;

4. the accuracy of the software used to determine sealed source positions from radiographic images; and

5. the accuracy of electronic transfer of the treatment delivery parameters to the treatment delivery unit from the treatment planning system.

La. Admin. Code tit. 33, § XV-755

Promulgated by the Department of Environmental Quality, Office of Air Quality and Radiation Protection, Radiation Protection Division, LR 18:34 (January 1992), amended by the Office of Environmental Assessment, Environmental Planning Division, LR 30:1181 (June 2004), amended by the Office of the Secretary, Legal Affairs Division, LR 32:814 (May 2006).

AUTHORITY NOTE: Promulgated in accordance with R.S. 30:2001 et seq.