Document Detail

Determination of uranium isotopes in soil core samples collected on the JCO grounds after the criticality accident.
MedLine Citation:
PMID:  11718329     Owner:  NLM     Status:  MEDLINE    
To evaluate the impact of the 1999 criticality accident in Tokai-mura on the U isotope composition in soils, U isotopes (235U and 238U) were determined with inductively coupled plasma-mass spectrometry (ICP-MS) for soil core samples collected on the JCO grounds after the accident. The 235U/238U ratios were higher than the natural ratio in most samples. The highest ratio observed was 0.0262. Although vertical profiles of the 235U/238U ratio differed among the soil cores, the ratios tended to be high at the surface and decreased with depth. The U concentration also changed with depth. The percentages of 235U in the excess U, estimated from the positive correlation between U concentration and the 235U/238U ratio in soil samples, were less than 4% by mass (mostly 1-3%) and were much lower than the enrichment of the U used in the uranium conversion building at the time of the criticality accident (18.8%). These findings indicate that enriched U had been released before the criticality accident during the U processing at JCO in connection with the reconversion of light water reactor fuel. Since the range of the U concentrations found was comparable to the range of uncontaminated Japanese surface soils, the amount of U added to the soil was judged negligible from a radiation protection viewpoint.
S Yoshida; Y Muramatsu; K Tagami
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  35     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2001 Nov 
Date Detail:
Created Date:  2001-11-22     Completed Date:  2002-04-18     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4174-9     Citation Subset:  IM    
Environmental and Toxicological Sciences Research Group, National Institute of Radiological Sciences, Chiba-shi, Chiba, Japan.
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MeSH Terms
Mass Spectrometry
Radioactive Hazard Release
Radioisotopes / analysis
Soil / analysis*
Soil Pollutants, Radioactive / analysis*
Uranium Compounds / analysis*
Water Pollution, Radioactive / analysis*
Reg. No./Substance:
0/Radioisotopes; 0/Soil; 0/Soil Pollutants, Radioactive; 0/Uranium Compounds

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