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ABC Equipment
AN/PPD-TI (Training Radiac)

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.  

The operation of the AN/PDR-TI was sensitive to heat, cold,humidity and sand.




 
 
 
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