Code of Massachusetts Regulations › 105 CMR - DEPARTMENT OF PUBLIC HEALTH › Title 105 CMR 120.000 - The Control of Radiation › REPORTS › Section 120.643 - Access Control

Current through Register 1525, July 5, 2024
(A) Each entrance
				to a radiation room at a panoramic irradiator must have a door or other
				physical barrier to prevent inadvertent entry of personnel if the sources are
				not in the shielded position. Product conveyor systems may serve as barriers as
				long as they reliably and consistently function as a barrier. It must not be
				possible to move the sources out of their shielded position if the door or
				barrier is open. Opening the door or barrier while the sources are exposed must
				cause the sources to return promptly to the shielded position. The personnel
				entrance door or barrier must have a lock that is operated by the same key used
				to move the sources. The doors and barriers must not prevent any individual in
				the radiation room from leaving.
(B) In addition, each entrance to a radiation
				room at a panoramic irradiator must have an independent backup access control
				to detect personnel entry while the sources are exposed. Detection of entry
				while the sources are exposed must cause the sources to return to their fully
				shielded position and must also activate a visible and audible alarm to make
				the individual entering the room aware of the hazard. The alarm must also alert
				at least one other individual who is onsite of the entry. That individual shall
				be trained on how to respond to the alarm and prepared to promptly render or
				summon assistance.
(C) A radiation
				monitor must be provided to detect the presence of high radiation levels in the
				radiation room of a panoramic irradiator before personnel entry. The monitor
				must be integrated with personnel access door locks to prevent room access when
				radiation levels are high. Attempted personnel entry while the monitor measures
				high radiation levels, must activate the alarm described in 105 CMR 120.643(B).
				The monitor may be located in the entrance (normally referred to as the maze)
				but not in the direct radiation beam.
(D) Before the sources move from their
				shielded position in a panoramic irradiator, the source control must
				automatically activate conspicuous visible and audible alarms to alert people
				in the radiation room that the sources will be moved from their shielded
				position. The alarms must give individuals enough time to leave the room before
				the sources leave the shielded position.
(E) Each radiation room at a panoramic
				irradiator must have a clearly visible and readily accessible control that
				would allow an individual in the room to make the sources return to their fully
				shielded position.
(F) Each
				radiation room of a panoramic irradiator must contain a control that prevents
				the sources from moving from the shielded position unless the control has been
				activated and the door or barrier to the radiation room has been closed within
				a preset time after activation of the control.
(G) Each entrance to the radiation room of a
				panoramic irradiator and each entrance to the area within the personnel access
				barrier of an underwater irradiator must be posted as required by
				105 CMR
				120.238. Radiation postings for panoramic
				irradiators must comply with the posting requirements of
				105 CMR
				120.238, except that signs may be removed,
				covered, or otherwise made inoperative when the sources are fully
				shielded.
(H) If the radiation room
				of a panoramic irradiator has roof plugs or other movable shielding, it must
				not be possible to operate the irradiator unless the shielding is in its proper
				location. The requirement may be met by interlocks that prevent operation if
				shielding is not placed properly or by an operating procedure requiring
				inspection of shielding before operating.
(I) Underwater irradiators must have a
				personnel access barrier around the pool which must be locked to prevent access
				when the irradiator is not attended. Only operators and facility management may
				have access to keys to the personnel access barrier. There must be an intrusion
				alarm to detect unauthorized entry when the personnel access barrier is locked.
				Activation of the intrusion alarm must alert an individual (not necessarily
				onsite) who is prepared to respond or summon assistance.