Evaluation of a Wet Chemistry Method for Isolation of Cyclotron Produced [211At]Astatine
| Autor: | Katherine Gagnon, D.S. Wilbur, Ming-Kuan Chyan, Sujit Pal, Shigeki Watanabe, Ethan R. Balkin, Donald K. Hamlin |
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| Rok vydání: | 2013 |
| Předmět: |
Cyclotron
radioHPLC chemistry.chemical_element reductive distillation 010403 inorganic & nuclear chemistry lcsh:Technology 01 natural sciences law.invention Bismuth lcsh:Chemistry 03 medical and health sciences 0302 clinical medicine law General Materials Science Irradiation Astatine lcsh:QH301-705.5 Instrumentation Distillation Dissolution Fluid Flow and Transfer Processes wet chemistry isolation astatine-211 bismuth attenuation factor lcsh:T Process Chemistry and Technology Attenuation General Engineering lcsh:QC1-999 6. Clean water 0104 chemical sciences Computer Science Applications lcsh:Biology (General) lcsh:QD1-999 chemistry lcsh:TA1-2040 030220 oncology & carcinogenesis lcsh:Engineering (General). Civil engineering (General) lcsh:Physics Wet chemistry Nuclear chemistry |
| Zdroj: | Applied Sciences; Volume 3; Issue 3; Pages: 636-655 Applied Sciences, Vol 3, Iss 3, Pp 636-655 (2013) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app3030636 |
| Popis: | A “wet chemistry” approach for isolation of 211At from an irradiated bismuth target is described. The approach involves five steps: (1) dissolution of bismuth target in conc. HNO3; (2) removal of the HNO3 by distillation; (3) dissolution of residue in 8 M HCl; (4) extraction of 211At from 8 M HCl into DIPE; and (5) extraction of 211At from DIPE into NaOH. Results from 55 “optimized” 211At isolation runs gave recovery yields of approximately 78% after decay and attenuation corrections. An attenuation-corrected average of 26 ± 3 mCi in the target provided isolated (actual) yields of 16 ± 3 mCi of 211At. A sixth step, used for purification of 211At from trace metals, was evaluated in seven runs. In those runs, isolated 211At was distilled under reductive conditions to provide an average 71 ± 8% recovery. RadioHPLC analyses of the isolated 211At solutions, both initial and after distillation, were obtained to examine the 211At species present. The primary species of 211At present was astatide, but astatate and unidentified species were also observed. Studies to determine the effect of bismuth attenuation on 211At were conducted to estimate an attenuation factor (~1.33) for adjustment of 211At readings in the bismuth target. |
| Databáze: | OpenAIRE |
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