Understanding Neutron Radiography Post Exam Reading VIII-Part 2a of 2A

Ion Chamber Charger & Reader
Radiac Computer-Indicator CP-95A/PD is designed as a portable radiac computer-indicator, for computing & indicating the total amount of X and gamma radiation to which Radiac Detector
DT-60()/PD has been exposed (and thus revealing the X and gamma radiation to which the wearer of the DT-60()/PD had been exposed). The CP-95A/PD operates in conjunction with
Radiac Detector DT-60()/PD (not supplied) which contains a specially compounded silver-actuated phosphor glass. When the total radiation dosage of a DT-60()/PD is to be measured, the
DT-60()/D is placed in Radiac Computer-Indicator C-95A/PD and exposed to a source of ultraviolet light. The ultraviolet light causes the silver-activated glass to emit an orange
luminescence, the intensity of which is proportional to the total amount of radiation the glass has received. The intensity of the orange luminescence is measured by a photomultiplier tube
which is fitted with a filter to prohibit the passage of blue and green light. The photomultiplier tube employs the principle of secondary emission to amplify the initial electron emission caused
by the filtered orange illumination of the light-sensitive cathode. The output of the photomultiplier tube is applied to an indicating circuit to indicate the total amount of radiation to which the
wearer of the DT60()/PD has been exposed.
Charlie Chong/ Fion Zhang
http://www.orau.org/ptp/collection/radiac/CP95APD.htm