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福島第一原子力発電所で採取された固形分を含む滞留水の$$alpha$$核種分析,11; 酸浸漬による微粒子及び$$alpha$$核種の溶解挙動

$$alpha$$-emitting nuclides analysis of the stagnant water including sediments in Fukushima Daiichi NPS, 11; Dissolution of fine particles and $$alpha$$-emitting nuclides by immersing in an acid solution

蓬田 匠   ; 森井 志織  ; 岡 壽崇   ; 駒 義和  ; 北辻 章浩  

Yomogida, Takumi; Morii, Shiori; Oka, Toshitaka; Koma, Yoshikazu; Kitatsuji, Yoshihiro

滞留水固形分の$$alpha$$核種は主に鉄粒子やU粒子として存在している。酸溶液を用いた浸漬により鉄粒子を選択的に溶解し、これらの粒子中の$$alpha$$核種の存在割合を調べることを試みた。固形分中のウランの多くは、他の$$alpha$$核種と同様に鉄粒子上に存在し、U粒子としての存在割合は5%以下であると推察される。

Most of $$alpha$$-emitting nuclides in sediment of stagnant water exist as iron particles and U particles. An attempt was made to selectively dissolve iron particles by immersion in an acid solution and investigate the abundance of $$alpha$$-nuclides in these particles. Most of the uranium in the sediment is present on iron particles like other alpha nuclides, and the proportion of uranium present as U particles is estimated to be 5% or less.

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