IM-147/PD Pocket Dosimeter (ca. 1965-1985)
The IM-135B/PD is a military direct reading pocket dosimeter that measures gamma ray exposures in the 0-50 roentgen range. The first reference I have for the IM-135/PD is the 1966 version of the List of Military and Civil Defense Radiac Devices. It is also described in the 1987 version of the list. The Directory of Radiac Equipment (ca. 1962) makes no mention of it.
The example in the photograph was manufactured by Landsverk. The plastic cap on the right end is used to protect the charging contact.
Size: 0.5” diameter and 4.5” long
Weight: ca. 2 oz.
Ionization chamber volume: ca. 0.5 cc
Manufacturers: Bendix and Landsverk
- Directory of Radiac Equipment NAVSHIPS 94200.5, no date, ca. 1961-62.
- 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.