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$$^{129}$$I/$$^{127}$$I ratios in surface waters of the English Lake District

英国湖水地方の表層水中$$^{129}$$I/$$^{127}$$I比の分布

安藤 麻里子  ; Schnabel, C.*; Cook, G.*; MacKenzie, A. B.*; Dougans, A.*; Ellam, R. M.*; Freeman, S.*; Maden, C.*; Olive, V.*; Synal, H.-A.*; Xu, S.*

Atarashi-Andoh, Mariko; Schnabel, C.*; Cook, G.*; MacKenzie, A. B.*; Dougans, A.*; Ellam, R. M.*; Freeman, S.*; Maden, C.*; Olive, V.*; Synal, H.-A.*; Xu, S.*

英・セラフィールド再処理工場に近い湖水地方において、海水,湖水及び河川水中の$$^{129}$$I/$$^{127}$$Iを2004年及び2005年に加速器質量分析装置(AMS)を用いて測定した。アイリッシュ海の$$^{129}$$I/$$^{127}$$I比は2.8$$times$$10$$^{-6}$$から8.2$$times$$10$$^{-6}$$であり、再処理工場からの液体放出の増加を反映して、1992年の測定結果の約10倍に増加した。湖水地方の湖水中$$^{129}$$I/$$^{127}$$Iは0.7$$times$$10$$^{-6}$$から6.4$$times$$10$$^{-6}$$であり、再処理工場からの距離に応じて指数関数的に減少した。

Accelerator Mass Spectrometry (AMS) was used to measure $$^{129}$$I/$$^{127}$$I ratios in surface sea, lake and river water samples collected in 2004 and 2005 from the English Lake District and from South west Scotland, areas which are in relatively close proximity to the Sellafield nuclear fuel reprocessing plant in north west England. The $$^{129}$$I/$$^{127}$$I ratios in surface water collected from the shore of the Irish Sea were in the range 2.8$$times$$10$$^{-6}$$ to 8.2$$times$$10$$^{-6}$$. These ratios are one order of magnitude higher than that of seawater collected from the Irish Sea in 1992, correlating with the increase in $$^{129}$$I content of the Sellafield liquid effluent discharge over the last decade. The $$^{129}$$I/$$^{127}$$I ratios in lakes in the Lake District were in the range 0.7$$times$$10$$^{-6}$$ to 6.4$$times$$10$$^{-6}$$ and decreased exponentially as a function of distance from Sellafield.

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パーセンタイル:39.23

分野:Geochemistry & Geophysics

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