エポキシ樹脂へのセシウム及びヨウ素の浸透挙動

Penetration behavior of Cs and I into epoxy resin

藤野 大生*; 松浦 治明*; 佐藤 勇*; 鈴木 恵理子   

Fujino, Daiki*; Matsuura, Haruaki*; Sato, Isamu*; Suzuki, Eriko

コンクリート構造材の表面塗料として用いられるエポキシ樹脂へのCs及びIの浸透挙動に係る知見を取得するために、室温・大気圧下及び高温・高圧下におけるCsI溶液への浸漬実験を行い、XRF及びEXAFS分析によりCs, Iの深さ方向における浸透量及び局所構造を調査した。深さ方向における浸透量測定の結果、室温・大気圧下と高温・高圧下とで差はみられず、表面付近(0.3mm)にのみ浸透した。一方、Iは高温・高圧下では浸透量が大きくなり、Csよりも深い位置まで浸透した。局所構造分析においても、CsとIの配位数が減少し、CsとOの配位数が増加していることを確認し、浸透量測定の結果を支持する結果を取得した。

To clarify the penetration behavior of Cs and I into epoxy resin which is used as painting of concrete, the penetration tests of CsI solution into epoxy resin at room temperature and under air pressure, or at high temperature and under high pressure. The penetration amounts and local structures of Cs and I were investigated by using XRF and EXAFS. Regarding the penetration amounts of Cs, Cs penetrated only near the surface and there is no difference between the two experimental conditions. However, I penetrated more deeper than Cs and the penetration amounts at high temperature and under high pressure was larger than that at room temperature and air pressure. The EXAFS results, the coordination number of Cs and I was decreased but that of Cs and O was increased, also supported the results of penetration amounts.