Radiation Survey of X-Ray Output of an Electron Microscope from Personnel Hazard Viewpoint

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Abstract
With the beam current of the electron microscope at 200 ua the avg. dosage of X-ray at the port of the primary viewing screen was 1500 mr/hr. as measured with a calibrated Keleket dosimeter. The dosage at the intermediate viewing port was 70 mr/hr. The maximum permissable exposure in this laboratory is 50 mr/day. Detns. of dosage as a function of beam current indicate the intensity of radiation to vary directly with beam current. Detn. of the hardness of the beam and attenuation of the beam by aluminum filters indicates a continuous spectrum with a peak energy at 0.45-0.50 A. The X-rays arise from bombardment of bronze components of the microscope by the 50-kv electrons. Insertion of a 0.25 in. thick plug of lead glass in the viewing port reduced the dosage through port to less than 1 mr/hr.

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