AN/PDR-32 GM Survey Meter (early 1950s)
A high range meter that employs two halogen quenched
GM tubes connected in parallel. Normally a GM tube would not be used in a
high end instrument because it would be prone to saturation. However, this
is not a problem if the detector operates in the current mode (i.e, the
circuit integrates the charge) rather than the more usual pulse mode. A
vibrator type transformer (similar to an induction coil) is used to step
up the high voltage. The meter employs a five decade logarithmic scale
from 5 mR/h to 500 R/h. It
seems that this unit was based on the LeVine meter (see Levine
The AN/PDR-32 was identified as being obsolete in the 1975 version of the List of Radiacs in the Navy Program
Manufactured by Anton Electronic Laboratories, Inc.,
to 500 R/h
speaker, but employs hearing aid type of headset
Size: 3” x 3.25” x 6.5”
Batteries: two 1.5 volt
Levine, H.D. and H.J. DiGiovanni, “An Inexpensive,
Wide Range Gamma Ray Geiger Survey Meter, NYO-1538, January 1951.
Morgan, K.Z., “Health Control and Nuclear Research”,
unpublished manuscript, ca. 1951 - 1955.
Naval Electronic Systems Command, List of Radiacs in the Navy Program P-9670-1, February 1975.
Department of the Navy, Directory of Radiac Equipment, NAVSHIPS 94200.5, page date April 1958.
Copyright 1999, Oak Ridge Associated Universities