Section 325.5482. X-ray equipment.

(1) Tube housing leakage from analytical x-ray sources shall not exceed 0.5 milliroentgen per hour at a 5 centimeter distance from the surface of the tube housing with the beam ports blocked and the tube operating at its leakage technique factors. Also, radiation originating from the high voltage power supplies shall not exceed this limit.

(2)   For instruments in which the primary x-ray beam is completely enclosed, the radiation shall be less than 2 mR per hour at  a distance  of 25 centimeters from the cabinet surface.

(3)   For enclosed equipment, interlocks shall be provided on all access panels which will terminate exposure and prevent operation while the panel is removed.

(4)   For open beam analytical x-ray equipment:

(a)   X-ray diffraction cameras shall have the appropriate ports arranged so that the camera collimating system shall be in place before the x-ray tube can be energized or the shutter can be opened.

(b)      An adapter between the x-ray tube and the collimator   of  the diffractometer camera or other accessory shall provide the same protection as required by subrule (1).

(c)    Safety interlocks shall never be used as routine cut-off switches during normal operation. They shall be operated as safety devices only, and tested periodically. When the interlock system does turn off the x-ray beam, it shall be necessary to reset the "on" switch at the control panel to resume operation.

(d)   Tube head ports which are not in use shall be secured in a closed position and interlocked to the x-ray generator or warning system.

(e)     The shutter indicator shall be conspicuously displayed to disclose the "open"   or "closed" position of the shutter.

(f)   The instrument shall display a conspicuous warning label such as "CAUTION RADIATION - THIS EQUIPMENT PRODUCES X-RADIATION WHEN ENERGIZED."

(g)   A red warning light shall indicate "X-RAY ON" when the equipment is producing x- rays. Other signal lights or alarms shall operate only to indicate a malfunction which may produce a   radiation,  electrical  or  other hazard.

History: 1979 AC.