35.633—Full calibration measurements on remote afterloader units.
(a)
A licensee authorized to use a remote afterloader unit for medical use shall perform full calibration measurements on each unit—
(i)
Following replacement of the source or following reinstallation of the unit in a new location outside the facility; and
(ii)
Following any repair of the unit that includes removal of the source or major repair of the components associated with the source exposure assembly; and
(3)
At intervals not exceeding 1 quarter for high dose-rate, medium dose-rate, and pulsed dose-rate remote afterloader units with sources whose half-life exceeds 75 days; and
(b)
To satisfy the requirement of paragraph (a) of this section, full calibration measurements must include, as applicable, determination of:
(d)
A licensee shall make full calibration measurements required by paragraph (a) of this section in accordance with published protocols accepted by nationally recognized bodies.
(e)
In addition to the requirements for full calibrations for low dose-rate remote afterloader units in paragraph (b) of this section, a licensee shall perform an autoradiograph of the source(s) to verify inventory and source(s) arrangement at intervals not exceeding 1 quarter.
(f)
For low dose-rate remote afterloader units, a licensee may use measurements provided by the source manufacturer that are made in accordance with paragraphs (a) through (e) of this section.
(g)
A licensee shall mathematically correct the outputs determined in paragraph (b)(1) of this section for physical decay at intervals consistent with 1 percent physical decay.
(h)
Full calibration measurements required by paragraph (a) of this section and physical decay corrections required by paragraph (g) of this section must be performed by the authorized medical physicist.