[1B07-11] Residual Water Analysis

[1B09] α-emitting nuclides analysis of the stagnant water including sediments in Fukushima Daiichi NPS

(9) Analysis of fine particle containing α-emitting nuclides

Takumi Yomogida¹, Kazuki Ouchi¹, Shiori Morii¹, *Toshitaka Oka¹, Yoshihiro Kitatsuji¹, Yoshikazu Koma¹, Katsuhiro Konno² (1. JAEA, 2. TEPCO HD)

Keywords:Fukushima Daiichi NPS, Stagnant water, Fine particle, SEM-EDX, Alpha-track

Fine particles containing α-nuclides in sediment of stagnant water of Unit 1 were analyzed. We have detected several sub-μm to a few μm size particles containing U by SEM-EDX, these particles contain elements derived from fuel cladding materials such as Zr, suggesting the possibility that these particles are fine fuel debris. On the other hand, by the alpha-track method, we have detected fine particles main composed of iron oxide with a diameter from 10 μm to a few hundred μm, which attached Pu, Am and Cm on their surface. These results indicated that the existence forms of α-nuclides were similar to those in the stagnant water of Units 2 and 3.