Section 120.582 - Additional Technical Requirements for Mobile Remote Afterloader Units(A) A licensee providing mobile remote afterloader service shall: (1) Check survey instruments for consistent response 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 105 CMR 120.580, 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 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 105 CMR 120.582(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 105 CMR 120.582(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 105 CMR 120.582(B) in accordance with 105 CMR 120.592(J).Amended by Mass Register Issue 1480, eff. 10/14/2022.