IM-179 Miniature Ratemeter

The IM-179/PD was “a miniature gamma ratemeter for placement in aircrew survival kits” that employed a pressurized ion chamber. It only used two push button controls: read and test.  The meter and dial are luminescent (Ra-226 radioluminescent paint) . The instructions on the case are self-explanatory.

Range: 0.02 to 200 R/hr on a single non-linear scale

Size: 2.5” x  4.25” x  1.25”

Weight: ca. 9 oz.

Manufacturers: Victoreen Instrument Company, Nuclear Corporation of America, Jordan Electronics, Heat Pipe Corporation of America

References

Defense Atomic Support Agency, List of Military and Civil Defense Radiac Devices. DASA 1243 revised, 1966.

Defense Nuclear Agency List of Military and Civil Defense Radiac Devices HQDNA (AR) 3M Revised, August 1987.

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