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タイトルセシウムで汚染された環境中で測定された周辺線量当量率の解析; シンチレーション検出器の方向依存性の補正について
翻訳タイトルAnalyses of H*(10) dose rates measured in environment contaminated by radioactive caesium; Correction of directional dependence of scintillation detectors
情報提供機関Oxford University Press
著者津田 修一
著者谷垣 実
著者吉田 忠義
著者奥村 良
著者斎藤 公明
掲載日2021-03
言語eng
ページ数228p.-236p.
種別report
内容記述Environmental dose rate monitoring has been performed with various scintillation detectors since the Fukushima Dai-ichi Nuclear Power Plant accident. Gamma-rays from caesium isotopes deposited in soil enter radiation detectors in any direction, but directional dependence of the detectors used for dose rate measurements are not always uniform and the dose rates vary even if measurement takes place at the same place. To investigate the influence of crystal configurations on dose rate, dose rate measurements using several scintillation detectors with different crystal configurations were conducted. By measuring pulse height spectra and multiplying them with spectrum - dose conversion operators (G(E) function), dose rates were deduced and compared. It was found that the dose rates varied within approximately 25% among six detectors. To reduce the differences, the dose rate using G(E) functions determined in rotational geometry were obtained and applied instead. The revised dose rates agreed with one another within uncertainties, but this was not the case of scintillation detector with flat crystal shape, and it means this method could not compensate its strong directional dependence. These experimental results reveal that detectors with superior directional characteristics should be used for environmental dose rate measurement since the compensation of directional dependence using a G(E) function determined in rotational geometry is not always available.
情報源JOPSS関連URL関連URL
URIhttps://f-archive.jaea.go.jp/dspace/handle/faa/271473