Abstract
Astatine was separated from a lead target, irradiated with 7Li ion beams, by dry distillation. Dry distillation was conducted in a glass test tube filled with nitrogen gas by heating the test tube with an electric furnace at 650 °C. The optimized conditions of the dry distillation procedure were studied by monitoring astatine radioactivity with gamma-ray spectrometers. The separation of astatine was accomplished in ~ 10 min. The cooling of the middle portion of the test tube was instrumental in recovering astatine radioactivity in high yields. The adsorption temperature of astatine on the glass surface was ~ 20 °C.
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