A. Toyoshima, Kojiro Nagata, K. Ooe, Zijian Zhang, Takumi Ikeda, Soichiro Ichimura, Honoka Obata, T. Yoshimura, A. Shinohara
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Dispersal rates of astatine-211 from aqueous solutions and chloroform
The dispersal rates of 211 At, which is a promising nuclide for targeted alpha therapy, from aqueous solutions and chloroform were studied to provide experimental evidence for the reasonable evaluation of its airborne concentration in a radiation-controlled area. Using a collection unit for dispersed 211 At during ventilation, radioactivity of the trapped 211 At was quantified. The dispersal rates of 211 At in chloroform as well as acidic, neutral, and alkaline solutions, in addition to a neutral solution containing ascorbic acid, were determined. Thin-layer chromatography was also performed to identify the formed chemical species of 211 At. The dispersal rate of 211 At was very low in the neutral solution containing ascorbic acid and in chloroform. The chemical forms of 211 At in aqueous solutions are also briefly discussed.
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