An Evaluation of Activated Bismuth Isotopes in Environmental Samples From the Former Western Pacific Proving Grounds

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{sup 207}Bi (t{sub 1/2}=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 {sup 207}Bi were analyzed by gamma spectrometry in an attempt to determine the relative concentrations of {sup 208}Bi (t{sup 1/2} = 3.68 x 10{sup 5} y). The bismuth isotopes were probably generated during the ''clean'', 9.3 Mt Poplar test held on 7/12/58. The atom ... continued below

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Robison, W.L.; Brunk, J.A. & Jokela, T.A. March 21, 2000.

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{sup 207}Bi (t{sub 1/2}=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 {sup 207}Bi were analyzed by gamma spectrometry in an attempt to determine the relative concentrations of {sup 208}Bi (t{sup 1/2} = 3.68 x 10{sup 5} y). The bismuth isotopes were probably generated during the ''clean'', 9.3 Mt Poplar test held on 7/12/58. The atom ratio of {sup 208}Bi to {sup 207}Bi (R value) ranges from {approx}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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127 Kilobytes pages

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  • International Topical Conference: Methods and Applications of Radioanalytical Chemistry V, (MARC V), Kailua-Kona, HI (US), 04/09/2000--04/14/2000

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  • Report No.: UCRL-JC-135850
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 792621
  • Archival Resource Key: ark:/67531/metadc735527

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 21, 2000

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  • Oct. 19, 2015, 7:39 p.m.

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  • May 6, 2016, 1:18 p.m.

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Robison, W.L.; Brunk, J.A. & Jokela, T.A. An Evaluation of Activated Bismuth Isotopes in Environmental Samples From the Former Western Pacific Proving Grounds, article, March 21, 2000; California. (digital.library.unt.edu/ark:/67531/metadc735527/: accessed December 10, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.