Bismuth er et grundstof,
nr. 83 i det
Bismuth er en neutronreflektor som anvendes i fremstilling af atomvåben, allerede i Manhattan Engineer District under anden verdenskrig.
Radioaktivt bismuth kan spores i forbindelse med
eksempelvis ved Bikini og
Enewetak i Stillehavet.
- Se også: Atomfysik.
- History of the Dayton Project. / Keith V. Gilbert.
- Miamisburg. Ohio. Mound Laboratory. Monsanto Research
Corporation, Monsanto Company, 1969.
- An Evaluation of Activated Bismuth Isotopes in Environmental Samples from the Former Western
Pacific Proving Grounds. / : V.E. Noshkin et al.
Lawrence Livermore National Laboratory
Technical Information Department’s Digital Library, 2000.
207Bi (t1/2=32.2 y) was generated by activation of weapons material during a few “clean” nuclear tests at the U.S. Western Pacific Proving Grounds of Enewetak and Bikini Atolls. The radionuclides first appeared in the Enewetak environment during 1958 and in the environment of Bikini during 1956. Crater sediments from Bikini with high levels of 207Bi were analyzed by gamma spectrometry in an attempt to determine the relative concentrations of 208Bi (t1/2=3.68x105 y). The bismuth isotopes were probably generated during the “clean”, 9.3 Mt Poplar test held on 7/12/58. The atom ratio of208Bi to 207Bi (R value) ranges from ~12 to over 200 in sections of core sediments from the largest nuclear crater at Bikini atoll. The presence of bismuth in the device is suggested to account for R values in excess of 10.
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