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http://dx.doi.org/10.1016/j.net.2019.06.017

Ambient dose equivalent measurement with a CsI(Tl) based electronic personal dosimeter  

Park, Kyeongjin (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
Kim, Jinhwan (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
Lim, Kyung Taek (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
Kim, Junhyeok (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
Chang, Hojong (Institute for Information Technology Convergence, Korea Advanced Institute of Science and Technology)
Kim, Hyunduk (IRIS Co., Ltd.)
Sharma, Manish (Department of Nuclear Engineering, Khalifa University)
Cho, Gyuseong (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
Nuclear Engineering and Technology / v.51, no.8, 2019 , pp. 1991-1997 More about this Journal
Abstract
In this manuscript, we present a method for the direct calculation of an ambient dose equivalent (H* (10)) for the external gamma-ray exposure with an energy range of 40 keV to 2 MeV in an electronic personal dosimeter (EPD). The designed EPD consists of a 3 × 3 ㎟ PIN diode coupled to a 3 × 3 × 3 ㎣ CsI (Tl) scintillator block. The spectrum-to-dose conversion function (G(E)) for estimating H* (10) was calculated by applying the gradient-descent method based on the Monte-Carlo simulation. The optimal parameters for the G(E) were found and this conversion of the H* (10) from the gamma spectra was verified by using 241Am, 137Cs, 22Na, 54Mn, and 60Co radioisotopes. Furthermore, gamma spectra and H* (10) were obtained for an arbitrarily mixed multiple isotope case through Monte-Carlo simulation in order to expand the verification to more general cases. The H* (10) based on the G(E) function for the gamma spectra was then compared with H* (10) calculated by simulation. The relative difference of H* (10) from various single-source spectra was in the range of ±2.89%, and the relative difference of H* (10) for a multiple isotope case was in the range of ±5.56%.
Keywords
Electronic personal dosimeter; Ambient dose equivalent; G(E) function; PIN diode; CsI(Tl) scintillator;
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