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ABC Equipment
IM-75/PDR-18A

The NAVSHIPS 94200.5 Directory of Radiac Equipment (ca. 1960) states: "The AN/PDR-18, -18A, -18B are portable instruments used to detect and measure high intensity gamma radiation on a direct reading meter . The detection of gamma radiation in this instrument is accomplished by means of  a sensitive phosphor element. Gamma radiation impinging on the phosphor causes it to fluoresce and illuminate a photomultiplier tube."  


 
 
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