Section 144-220-G-H-643 - Periodic spot-checks for remote afterloader unitsA. A licensee authorized to use a remote afterloader unit for medical use shall perform spot- checks of each remote afterloader facility and on each unit: (1) Before the first use of a high dose-rate, medium dose-rate, or pulsed dose-rate remote afterloader unit on a given day;(2) Before each patient treatment with a low dose-rate remote afterloader unit; and(3) After each source installation.B. A licensee shall perform the measurements required by G.643.A in accordance with written procedures established by the authorized medical physicist. That individual need not actually perform the spot check measurements.C. A licensee shall have the authorized medical physicist review the results of each spot-check within 15 days. The authorized medical physicist shall notify the licensee as soon as possible in writing of the results of each spot-check.D. To satisfy the requirements of G.643.A, spot-checks must, at a minimum, assure proper operation of: (1) Electrical interlocks at each remote afterloader unit room entrance;(2) Source exposure indicator lights on the remote afterloader unit, on the control console, and in the facility;(3) Viewing and intercom systems in each high dose-rate, medium dose-rate, and pulsed dose-rate remote afterloader facility;(4) Emergency response equipment;(5) Radiation monitors used to indicate the source position;(7) Clock (date and time) in the unit's computer; and(8) Decayed source(s) activity in the unit's computer.E. If the results of the checks required in G.643.D 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.F. A licensee shall retain a record of each check required by G.643.D and a copy of the procedures required by G.610.B in accordance with G.2643.10-144 C.M.R. ch. 220, § G-H-643