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  • 1 Gunma University Department of Chemistry, Faculty of General Studies 4-2 Aramaki, Maebashi 371 Gunma Japan
  • | 2 Gunma University Department of Chemistry, Faculty of Engineering Kiryu 376 Gunma Japan
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Applying rapid radiochemical separation of iodine coupled with epithermal neutron activation, we reliably determined trace amounts /6–95 ng/ of iodine in rock samples such as sedimentary rocks and chondritic meteorites. Our data on meteorites are in good agreement with literature values, but for sedimentary rocks the present data were systematically lower than the literature values. Based on the data from duplicate analyses of some sedimentary rocks and the results of tracer experiments employed parallel to the rock analyses, we concluded that the analytical results obtained in this work for sedimentary rocks were more reliable than the literature values.