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タイトル放射線防護のための超高分解能alphaイメージャーを用いたプルトニウム粒子のイメージング
翻訳タイトルPlutonium dioxide particle imaging using a high-resolution alpha imager for radiation protection
情報提供機関Nature Publishing Group
著者森下 祐樹
著者黒澤 俊介
著者山路 晃広
著者林 真照
著者笹野 理
著者牧田 泰介
著者東 哲史
掲載日2021-03
言語eng
ページ数5948\_1p.-5948\_11p.
種別report
内容記述The internal exposure of workers who inhale plutonium dioxide particles in nuclear facilities is a crucial matter for human protection from radiation. To determine the activity median aerodynamic diameter values at the working sites of nuclear facilities in real time, we developed a high-resolution alpha imager using a ZnS(Ag) scintillator sheet, an optical microscope, and an electron-multiplying charge-coupled device camera. Then, we designed and applied a setup to measure a plutonium dioxide particle and identify the locations of the individual alpha particles in real time. Employing a Gaussian fitting, we evaluated the average spatial resolution of the multiple alpha particles was evaluated to be 16.2 umFWHM with a zoom range of 5 x. Also, the spatial resolution for the plutonium dioxide particle was 302.7 umFWHM due to the distance between the plutonium dioxide particle and the ZnS(Ag) scintillator. The influence of beta particles was negligible, and alpha particles were discernible in the alpha-beta particle contamination. The equivalent volume diameter of the plutonium dioxide particle was calculated from the measured count rate. These results indicate that the developed alpha imager is effective in the plutonium dioxide particle measurements at the working sites of nuclear facilities for internal exposure dose evaluation.
情報源JOPSS関連URL関連URL
URIhttp://f-archive.jaea.go.jp/dspace/handle/faa/247752