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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The authors thank the crew of the JAEA Tandem Accelerator for accelerator operation. We are thankful to M. Asai for utilizing the Ge detector. This work was supported by JSPS KAKENHI Grant Number JP18K11939.
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Nishinaka, I., Hashimoto, K. Separation of astatine from irradiated lead targets based on dry distillation in a glass test tube. J Radioanal Nucl Chem 327, 869–875 (2021). https://doi.org/10.1007/s10967-020-07546-2
- Dry distillation
- Optimized conditions
- Lead target
- Adsorption temperature