§ 227a.35. Electron microscope devices.

 (a)  Labeling. A closed-beam electron microscope device must be labeled with a conspicuous sign bearing the words, ‘‘Caution Radiation—This Equipment Produces Radiation When Energized,’’ or words containing a similar warning.

 (b)  Maximum radiation level. Radiation levels measured 5 centimeters from an accessible surface of a closed-beam electron microscope may not exceed 0.5 mrem (0.005 mSv) per hour.

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