期刊
SCIENTIFIC REPORTS
卷 12, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41598-022-05500-8
关键词
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资金
- U.S. Department of Energy, Office of Science Isotope Program [DE-SC0018637, DE-SC0021220]
- U.S. Department of Energy National Nuclear Security Administration Stewardship Science Graduate Fellowship award [DE-NA0003864]
- Michigan State University, United States
- U.S. Department of Energy (DOE) [DE-SC0018637, DE-SC0021220] Funding Source: U.S. Department of Energy (DOE)
This study demonstrates the feasibility of gas-phase isotope harvesting from irradiated accelerator cooling-water and successfully collects Kr-76 and Kr-77 to generate Br-76 and Br-77. This technology has the potential for wider applications.
A flowing-water target was irradiated with a 150 MeV/nucleon beam of Kr-78 at the National Superconducting Cyclotron Laboratory to produce Kr-77 and Kr-76. Real-time gamma-imaging measurements revealed the mass transport of the krypton radioisotopes through the target-water processing, or isotope harvesting, system. The production rates were determined to be 2.7(1) x 10(-4) nuclei of Kr-76 and 1.18(6) x 10(-2) nuclei of Kr-77 formed per incident Kr-78 ion. Utilizing an off-gas processing line as part of the isotope harvesting system, a total of 7.2(1) MBq of Kr-76 and 19.1(6) MBq of Kr-77 were collected in cold traps. Through the decay, the daughter radionuclides Br-76 and Br-77 were generated and removed from the traps with an average efficiency of 77 +/- 12%. Due to the differences in half-lives of Kr-76 and Kr-77, it was possible to isolate a pure sample of Br-76 with 99.9% radionuclidic purity. The successful collection of krypton radioisotopes to generate Br-76 and Br-77 demonstrates the feasibility of gas-phase isotope harvesting from irradiated accelerator cooling-water. Larger-scale collections are planned for collecting by-product radionuclides from the Facility for Rare Isotope Beams.
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