Local structure analysis of Cs in concrete of reactor building

Koshigoe, Koki*; Sato, Isamu*; Miyahara, Naoya*; Suzuki, Eriko   ; Osaka, Masahiko  ; Matsuura, Haruaki*

For the waste management of radioactive concrete in the Fukushima Daiichi Nuclear Power Station, the Cs penetration behavior into concrete focused on the effects of aggregates was investigated by small-scale leaching tests of concrete with various contents of aggregates into CsI or CsCl dissolved water solution. The distribution in depth direction and chemical state of Cs were measured by using XRF and EXAFS, respectively. It was found that the Cs concentration and coordination number of O with Cs changed according to the content of aggregates. These results suggested importance of the effect of content of aggregates.