(1) If electrical power at a panoramic or beam-type irradiator is lost for longer than ten seconds, the sources must automatically return to the shielded position.

(2) The lock on the door of the radiation room of a panoramic or beam-type irradiator may not be deactivated by a power failure.

(3) During a power failure, the area of any irradiator where sources are located may be entered only when using an operable and calibrated radiation survey meter.