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核種分析,2; SEM-EDXおよびアルファトラック法による核種を含有する微粒子の検出

-emitting nuclides analysis of the stagnant water including sediments in Fukushima Daiichi NPS, 2; Detection of fine particle containing -emitters by SEM-EDX and alpha Track

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

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

3号機滞留水中の固形分の多数の粒子状物質の中から、核種を含有する微粒子の検出を試みた。SEM-EDXを用いる元素分析により、粒径数百nmから10m程度のUを主成分とする微粒子を検出した。また、アルファトラック法により、粒径100m程度までの鉄粒子上に核種が分布する様子を観測できた。

To investigate the morphology of -nuclides in solid fraction of the stagnant water in the Fukushima Dai-ichi nuclear Power Station's Unit 3 reactor, we tried to detect particles containing -nuclides by scanning electron microscopy-X-ray detection (SEM-EDX) and the alpha track method. As a result of SEM-EDX observation, several sub-m to 10 m size particles containing U were identified. The particles containing alpha emitters were identified by alpha-track method. These particles with few hundred m in diameter were mainly composed of iron.