Washington Administrative Code
Title 246 - Health, Department of
RADIATION
Chapter 246-240 - Radiation protection Medical use of radioactive material
PHOTON EMITTING REMOTE AFTERLOADER UNITS, TELETHERAPY UNITS, AND GAMMA STEREOTACTIC RADIOSURGERY UNITS
Section 246-240-375 - Full calibration measurements on gamma stereotactic radiosurgery units
Current through Register Vol. 24-24, December 15, 2024
(1) A licensee authorized to use a gamma stereotactic radiosurgery unit for medical use shall perform full calibration measurements on each unit:
(2) To satisfy the requirement of subsection (1) of this section, full calibration measurements must include determination of:
(3) A licensee shall use the dosimetry system described in WAC 246-240-366(1) to measure the output for one set of exposure conditions. The remaining radiation measurements required in subsection (2)(a) of this section may be made using a dosimetry system that indicates relative dose rates.
(4) A licensee shall make full calibration measurements required by subsection (1) of this section in accordance with published protocols accepted by nationally recognized bodies.
(5) A licensee shall mathematically correct the outputs determined in subsection (2)(a) of this section at intervals not exceeding one month for cobalt-60 and at intervals consistent with one percent physical decay for all other radionuclides.
(6) Full calibration measurements required by subsection (1) of this section and physical decay corrections required by subsection (5) of this section must be performed by the authorized medical physicist.
(7) A licensee shall retain a record of each calibration in accordance with WAC 246-240-614.
Statutory Authority: RCW 70.98.050. 06-05-019, § 246-240-375, filed 2/6/06, effective 3/9/06.