2019 年 18 巻 p. 16-22
The dispersal rates of 211At, 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 211At during ventilation, radioactivity of the trapped 211At was quantified. The dispersal rates of 211At 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 211At. The dispersal rate of 211At was very low in the neutral solution containing ascorbic acid and in chloroform. The chemical forms of 211At in aqueous solutions are also briefly discussed.