Section 325.5505. Equipment.

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(1) During any phase of operation of an electron microscope at the maximum rated continuous tube current for the maximum rated peak tube potential the radiation exposure rate as measured in air at a distance of 5 centimeters from any accessible   point on the external surface of the microscope shall not exceed 0.5 mR per hour.

(2)   Interlocks shall be provided on all potential radiation hazard access panels which will terminate exposure and prevent operation while the panel is removed.

(3)    The instrument shall display a conspicuous warning label such as “CAUTION RADIATION — THIS EQUIPMENT PRODUCES X-RADIATION WHEN ENERGIZED.”

History: 1979 AC.

                    
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