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KMID : 0364919980230040229
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Journal of Radiation Protection and Research
1998 Volume.23 No. 4 p.229 ~ p.236
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Evaluation of Characteristics in the Reference Gamma Radiation Fields for testing of Personnel Dosimetry performance
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오장진/Oh, Jang-Jin
조대형/한승재/나성호/이두희/이병수/전재식/Cho, Dae-Hyung/Han, Seung-jae/Na, Seong-Ho/Lee, Dew-hey/Lee, Byung-Soo/Jun, Jae-Shik
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Abstract
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In order to establish a testing system for personnel dosimetry performance, the radiation fields from photons, beta particles and neutrons are required, In recent, Korea Institute of Nuclear Safety(KINS) established the reference radation fields except neutrons and tested a variety of their properties. As a result of the test, the reference beams were shown to meet satisfactorily not only the standards of the International Organization for Standardization(ISO), but also the standard levels of the developed countries which are intercomparable with the international traceability. This paper describes the reference beam of gamma radiation. The self-designed and established reference radiation fields were investigated and analyzed by ISO and other international standards. The secondary photon contribution and the beam uniformity of the gamma radiation field were measured and evaluated to fulfill those requirements suggested by the ISO-4037. The measured air kerma rate for the 1s7Cs and 60Co gamma fields was 0.1891 --23.4967 Gy/s and 0.5844 - 15.9954 p Gy/s respectively. The uncertainty with 95% confidence level of the measured air kerma rate was determined to be. less than 2.5 % which is comparable to the international reference gamma radiation fields. It was found that the evaluated air kerma calibration factors of Exradin ionization chamber were in good agreement within 0.9 % and 0.03 % with those given by PTB and NIST, respectively. The gamma radiation fields installed at KINS can maintain traceability systems in Korea, Germany and United State.
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