Uranium determination by133Xe in meteorites; comparative study with fission track and/or239Np methods and thermal release character of133Xe |
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| Authors: | K. Sakamoto K. Itoh T. Takashima S. Yokoyama K. Yamazaki |
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| Affiliation: | (1) Department of Chemistry, Faculty of Science, Kanazawa University, 1-1 Marunouchi, 920 Kanazawa, (Japan);(2) Present address: The Matsui Pharmaceuticals Co. Ltd., Toyama, Japan;(3) The Yokohama Branch of the Mitani Sangyo Co. Ltd., Yokohama;(4) Present address: The Kanazawa Branch of the Ohtsuka Assay Laboratory Co. Ltd., Kanazawa, Japan;(5) Present address: The NAIG Nuclear Research Laboratory, Kawasaki, Kanagawa, Japan |
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| Abstract: | Uranium concentrations in three types of inclusions of the Allende (C III), a bulk sample of the Plainview (H5), and a bulk and 5 to 15 density separates of the Huckitta pallasite were determined and discussed by comparing the results from homogenized fission track and/or239Np analyses with the133Xe results. Stepwise heating experiment revealed that the133Xe release from the Plainview is bimordal and incomplete by a simple heating at 1600 °C, and that the133Xe releases in the Huckitta bulk and metallic samples are multitudinous but can be extracted rather completely at 1600–1700 °C. In the Huckitta, uranium-rich phase (∼100 ppb) was in the lightest density fraction of d=2.9–3.3, but the bulk uranium was found to be mostly from the heavy metal-rich fraction of d>4.2. |
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