The normal shielding, safety equipment and safety procedures are applicable for up to 75 kV peak X rays. Additional precautions are necessary for instruments operating at higher voltages. Prior to removal of shielding or before beginning work in the sample area, the operator must check both the warning lights and current meter on the console. The best way to avoid an accidental exposure is to turn the machine off before working in the sample area. Never put any part of the body in the primary beam. Exposure of any part of the body to the collimated beam for even a fraction of a second may result in damage to the exposed tissue.