Development of Cs separation methods from large amounts of soil samples to determine the Cs/Cs isotope ratio

Shimada, Asako ; Tsukahara, Takehiko*; Nomura, Masao*; Takeda, Seiji 

Since the Cs and Cs concentration level of environmental soil in prefectures adjacent to Fukushima is low at about 5.510 610 g g, a large amount of soil is required to obtain sufficient amount to measure them precisely. Two Cs separation methods which allow to treat large amounts of leached soil solution was developed: 1) a continuous butch extraction method using calix[4]arene-bis(t-octylbenzo-crown-6) and 2) a combination method of selective Cs adsorption using ammonium phosphotangstate and anion-cation exchange resins. These methods were applied to low Cs concentration samples, and good precision of 0.82.1% in the measurement of Cs/Cs isotope ratio was obtained.