Direct beta-ray measurement of Sr adsorbed on fiber surface; Preparation of 18-crown 6-ether derivative-impregnated Sr adsorption fiber based on the radiation-induced graft polymerization

Horita, Takuma ; Asai, Shiho; Konda, Miki; Hanzawa, Yukiko  ; Saito, Kyoichi*; Fujiwara, Kunio*; Kitatsuji, Yoshihiro  

There has been an increasing importance of the development of rapid separation techniques for Sr analysis, responding to needs in Fukushima Daiichi NPP. However, conventional Sr analytical methods require two different separation steps for Sr and Y, respectively, resulting in a long processing time of about one month. In this study, we prepared a Sr adsorptive fiber (Sr fiber) that has a high density Sr adsorption phase on its surface, allowing to highly efficient -ray counting by minimizing the self-attenuation effects. The adsorption capacity of the prepared Sr fiber was about 14 g/mol, which is equivalent to that of a commercially available Sr adsorptive resin (Sr Resin). The selectivity of the Sr fiber was nearly the same as that of the Sr resin. Considering that the Sr fiber has a specific surface area 1000 times smaller than that of the Sr Resin, the Sr ions can be concentrated to 1000 times on its surface, capable of achieving highly-efficient -ray counting. From these result, we confirmed that Sr fiber has adsorption capacity and selectivity necessary for highly efficient -ray counting of Sr.