An irradiation control device timer shall be provided to terminate the irradiation after a pre-set time interval or integrated charge on a dosimeter-based monitor.
- (1) A timer shall be provided at the treatment control panel. The timer shall indicate planned setting and the time elapsed or remaining;
- (2) A timer shall not permit an exposure if set at zero;
- (3) A timer shall be a cumulative device that activates with an indication of "BEAM-ON" and retains its reading after irradiation is interrupted or terminated. After irradiation is terminated and before irradiation can be reinitiated, it shall be necessary to reset the elapsed time indicator;
- (4) A timer shall terminate irradiation when a pre-selected time has elapsed, if any dose monitoring system has not previously terminated irradiation;
- (5) A timer shall permit setting of exposure times as short as 0.1 second;
- (6) A timer shall be accurate to within one percent of the selected value or 0.1 second, whichever is greater; and
- (7) A redundant treatment monitoring system (backup timer) shall be present at the treatment console to use as the treatment stop criterion in case the primary treatment control device timer malfunctions.
Statutory/Other Authority
ORS 453.605 - 453.807
Statutes/Other Implemented
ORS 453.605 - 453.807
History
PH 4-2013, f. & cert. ef. 1-29-13