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Nishiyama reservoir; Lead sources, inventory, and the influence of the Nagasaki atomic bomb

西山貯水池; 鉛の起源、流入量及び長崎原爆の影響

加田平 賢史*; 森脇 洋*; 石竹 美帆*; 國分 陽子; 山崎 秀夫*; 吉川 周作*

Katahira, Kenshi*; Moriwaki, Hiroshi*; Ishitake, Miho*; Kokubu, Yoko; Yamazaki, Hideo*; Yoshikawa, Shusaku*

本研究は、堆積物コア中の重金属濃度測定の結果から、長崎原爆の影響を含む環境汚染の変遷を明らかにしたものである。鉛同位体比を鉛汚染源の特定に用いた。堆積物コアは、長崎原爆爆心地の東約3kmにある貯水池より採取した。以前の研究により、本堆積物コアには、1945年の堆積層に長崎原爆起源と思われる高濃度の$$^{239+240}$$Puと$$^{137}$$Csが検出されている。重金属濃度及び鉛同位体比は、ICP-MSによって測定した。その結果、鉛濃度は、$$^{239+240}$$Puと$$^{137}$$Cs濃度が極大値を示した層で同じく極大値を示した。また、同層の鉛同位体比は、他の層と異なる値を示したことから、この層に負荷された鉛は、長崎原爆の爆発に起因するものと考えられる。

The objective of this study was to reveal historical changes in environmental pollution, including the influence of the Nagasaki atomic bomb, based on heavy metal concentrations in sediment core samples. Lead isotope ratios were used to determine the sources of Pb. A sediment core was sampled from a reservoir about 3 km east of the hypocenter of the Nagasaki atomic bomb. It was reported in a previous study that this sediment core contained high activities of $$^{239+240}$$Pu and $$^{137}$$Cs at the 1945 layer as a result of the Nagasaki atomic bomb. Concentrations of heavy metals and the Pb isotope ratios in sediments were measured using ICP-MS. The results show a spiked peak in the Pb concentrations in the same layer as that of the $$^{239+240}$$Pu and $$^{137}$$Cs. It is thought that the spiked peak is due to the loading of Pb by the Nagasaki atomic bombing, and this is supported by further results showing that the Pb isotope ratios in this layer were different from those in other layers.

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パーセンタイル:100

分野:Environmental Sciences

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