Section 144-220-G-H-647 - Additional technical requirements for mobile remote afterloader unitsA. A licensee providing mobile remote afterloader service shall:(1) Check survey instruments before medical use at each address of use or on each day of use, whichever is more frequent; and(2) Account for all sources before departure from a client's address of use.B. In addition to the periodic spot-checks required by G.643, a licensee authorized to use mobile afterloaders for medical use shall perform checks on each remote afterloader unit before use at each address of use. At a minimum, checks must be made to verify the proper operation of:(1) Electrical interlocks on treatment area access points;(2) Source exposure indicator lights on the remote afterloader unit, on the control console, and in the facility;(3) Viewing and intercom systems;(4) Applicators, source transfer tubes, and transfer tube-applicator interfaces;(5) Radiation monitors used to indicate room exposures;(6) Source positioning (accuracy); and(7) Radiation monitors used to indicate whether the source has returned to a safe shielded position.C. In addition to the requirements for checks in G.647.B, a licensee shall ensure overall proper operation of the remote afterloader unit by conducting a simulated cycle of treatment before use at each address of use.D. If the results of the checks required in G.647.B indicate the malfunction of any system, a licensee shall lock the control console in the off position and not use the unit except as may be necessary to repair, replace, or check the malfunctioning system.E. A licensee shall retain a record of each check required by G.647.B in accordance with G.2652.10-144 C.M.R. ch. 220, § G-H-647