Turning off a circuit breaker is not considered a disconnect. Bare feet are not permitted in the laboratory or around electrical equipment. Even slightly moist skin is an excellent electrical conductor, and contact with faulty ungrounded equipment may result in severe injury or death. Do not attempt to align x-ray cameras without first consulting an experienced person. Alignment procedures require special training and knowledge to reduce safety hazards.
Special care is required when one power supply is connected to more than one x-ray tube.
The screen must be expected to absorb only a small fraction of the incident radiation, and to emit fluorescent and other secondary radiations. A fluorescent screen should only be viewed through highly absorbing glass, preferably through 0.25-inch thick lead glass. It is especially important to avoid cracks and small gaps in the shielding materials. Shielding material must be large enough to contain the entire primary beam. If one of the lights is burned out, the operator must either replace it before leaving the room, or leave a note on the light assembly that the bulb is burned out.