Open-beam configurations must have a readily discernible indication of:
x-ray tube "on-off" status located near the radiation-producing equipment housing, if the primary beam is controlled in an "on-off" manner; or
shutter "open-closed" status located near each port on the radiation-producing equipment housing, if the primary beam is controlled in "open-closed" manner.
An easily visible warning light labeled with the words "X-RAY ON" or other visible warning indicator that clearly shows the equipment is producing ionizing radiation, must be located near a switch that energizes an x-ray tube and illuminated only when the tube is energized.
Warning devices must be labeled so that their purpose is easily identified.
MS s 144.12
32 SR 777
December 10, 2007