Or. Admin. R. 333-123-0075 - Timer

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 0.1second, 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.


Or. Admin. R. 333-123-0075
PH 4-2013, f. & cert. ef. 1-29-13

Stat. Auth.: ORS 453.605 - 453.807

Stats. Implemented: ORS 453.605 - 453.807

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