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福島第一原子力発電所2号機トーラス室滞留水の$$alpha$$核種分析,2; ICP-MSによる固形分の$$alpha$$核種分析

Analysis of alpha radionuclide in the contaminated water at the torus room of unit #2 reactor of Fukushima Daiichi NPS, 2; Analysis of alpha-emitting nuclides of solid components by ICP-MS

大内 和希  ; 蓬田 匠   ; 岡 壽崇   ; 北辻 章浩  ; 駒 義和  ; 今野 勝弘*

Ouchi, Kazuki; Yomogida, Takumi; Oka, Toshitaka; Kitatsuji, Yoshihiro; Koma, Yoshikazu; Konno, Katsuhiro*

滞留水中に粒子状固形分として含まれる$$alpha$$核種の存在状態を把握するため、孔径10, 1, 0.1, 0.02$$mu$$mのフィルタを用い粒径ごとに分級した固形分及びろ液中の$$alpha$$核種濃度とその組成をICP-MSで定量分析した。滞留水中の粒子状固形分から原子炉由来のUが検出され、その大部分は10$$mu$$m以上の粗大粒子として深部に沈降していると考えられる。微細粒子として浮遊あるいはイオンとして水中に存在するウランも確認できた。

In order to grasp the existence state of $$alpha$$-nuclides contained as particulate solids in the contaminated water, $$alpha$$-nuclide concentrations in the solids and the filtrate which classified according to particle size using filters with pore sizes of 10, 1, 0.1 and 0.02 $$mu$$m were quantitatively analyzed by ICP-MS. Reactor-derived U was detected in the particulate solids in the contaminated water, and most of them settled deeply as coarse particles of $$>$$10 $$mu$$m. U existing in the water as fine particles and ions was also confirmed.

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