Radioactive disequilibrium states of the U-series nuclides in soil samples from the JCO criticality accident site.
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Accession number;01A0231222
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| Title;Radioactive disequilibrium states of the U-series nuclides in soil samples from the JCO criticality accident site. |
| Author;
KAWABATA YOSHIKO
(Low Lev. Radioact. Lab., Kanazawa Univ.)
YAMAMOTO MASAYOSHI
(Low Lev. Radioact. Lab., Kanazawa Univ.)
MURATA YOSHIMASA
(Low Lev. Radioact. Lab., Kanazawa Univ.)
KOMURA KAZUHISA
(Low Lev. Radioact. Lab., Kanazawa Univ.)
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Journal Title;Abstracts of Papers. Symposium on Radiochemistry
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Journal Code:F0139B
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ISSN:1345-2762
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VOL.44th;NO.;PAGE.65(2000)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Soil samples collected from JCO campus following the criticality accident were analyzed for U (238,235,234U) and Th (232,230,228Th) isotopes to assess the possible contamination by U, based on the disequilibrium of the U-series nuclides. The concentrations of these nuclides and isotopic ratio (235U/238U) for a total of 39 samples were determined by alpha-spectrometry and ICP-MS, respectively. The radioactive equilibrium states of 238U, 234U and 230Th were recognized for the most of samples measured. However, some soil samples collected near and/or far the conversion building showed impressive radioactive disequilibrium states. The 235U/238U atomic ratios for these samples were also notably higher than natural ratio, 0.720%. The consideration of excess amounts of 238U, 235U and 234U for 230Th suggested the contamination of land by U with various enrichments up to an about 7.2%. (author abst.) |
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