Ir-192 Industrial Radiography Slide Rule (ca. 1960)

This slide rule for Ir-192 industrial radiography was manufactured by Technical Operations, Inc. of Arlington, Massachusetts. The copyright date is 1955, hence my guess that it dates from 1960 or so.

It had two basic functions: shielding calculations and exposure calculations.

Size: ca. 2" x 5" (plastic)

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Last updated: 12/16/11
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