Preliminary Evaluation of U.S. Army RADIAC Detector DT-236/PD and RADIAC Computer-Indicator CP-696/UD
ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD
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Performance of the DT-236PD and CP-696UD dosimetry system has been studied in preliminary tests at AFRRI in cobalt-60 and in TRIGA-reactor radiation fields. The test results are relevant to the reproducibility of the dosimeter reader, the variability of readings among identically irradiated of dosimeter response in the AFFRI radiation fields. The performance specifications for this system list or - 40 accuracy at doses of 50-1000 rads and or - 20- rad accuracy at 0-50 rads. The present tests showed the system to be capable of meeting these specifications and, with care, a level of accuracy of or - 10 to 20 was achieved at high doses. At low doses, the accuracy of the system was limited by the or - 20-rad 2 SD variability in readings of nonirradiated dosimeters. Factors found to improve the precision of dosimeter readings were a warm-up time of several hours for the reader unit, B sustained firm pressure on the mechanical switch that initiates the read cycle, c triplicate readings sustained firm pressure on the mechanical switch that initiates the read cycle, c triplicate readings of each dosimeter, d digital readout of the dose values, e proper accounting of dosimer predose readings, and f waiting 2 hours after irradiation before reading the dosimeter.
- Nuclear Instrumentation