2016年4月
Atmospheric discharge of C-14 from the Tokai reprocessing plant: comprehensive chronology and environmental impact assessment
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY
- ,
- ,
- 巻
- 53
- 号
- 4
- 開始ページ
- 546
- 終了ページ
- 553
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1080/00223131.2015.1062813
- 出版者・発行元
- TAYLOR & FRANCIS LTD
Quantitative evaluation of the atmospheric discharge of radiocarbon (C-14) is of primary importance for accurately assessing the radioecological impact of the operation of the Tokai reprocessing plant (TRP). However, monitoring the atmospheric C-14 discharge was not conducted at the TRP prior to October 1991. The main purpose of this study was to establish the chronology of atmospheric C-14 discharges for the entire operation period (1977-2014). We found a strong correlation between the C-14 discharge and spent fuel reprocessing data obtained after October 1991; we used this correlation to estimate the monthly C-14 discharges in the 1977-1991 period. The total amount of atmospheric C-14 discharge was estimated at 7741 +/- 217 GBq for the entire period, with the largest annual discharge of 978 GBq in 1992. Tree-ring C-14 analysis and model calculations using the established discharges were conducted to assess the excess C-14 concentrations around the TRP in the past. The results suggested that the excess C-14 concentrations were <45 Bq kg(-1) C and the annual effective dose via the atmosphere-rice ingestion pathway was as low as 1.2 mu Sv y(-1), indicating no significant radioecological impact of atmospheric C-14 discharges from the TRP.
- リンク情報
- ID情報
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- DOI : 10.1080/00223131.2015.1062813
- ISSN : 0022-3131
- eISSN : 1881-1248
- Web of Science ID : WOS:000370979000011