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Radiological Defense,AN/PDR-T-1 was the first ionization chamber
gamma survey meter to be built to military specifications. These
specifications were evolved from the Sandstone operational tests
of commercial instruments such as the 247A (IM-3/PD) and the
MX-6 (IM-40/PD). The AN/PDR-T-1 is thoroughly ruggedized and
will operate under any weather conditions of temperature and
humidity in which the batteries will operate. The chamber is so
constructed that it will operate in aircraft to an elevation of
at least 35,000 feet." The AN/PDR-T1, T1A and T1B are
described in the Directory of Radiac Equipment (page date, 1957)
as ionization chamber instruments used to detect the presence of
gamma-emitting radioactive materials and to train operators in
the use and maintenance of this type of equipment.� The T1B
differs slightly from the two earlier versions (T1 and T1A) in
that it has a built-in beta check source (activated by the
control knob just to the right of the meter face) and a circular
faced meter. No mention of any of the three models is made in
the 1966 version of the List of Military and Civil Defense
Radiac Devices suggesting that they were obsolete by then. The
calibration date on this particular instrument is September
1958. |
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