Determination of I-129 and I-127 in soil and tracer experiments on the adsorption of iodine on soil |
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Authors: | Y Muramatsu S Uchida Y Ohmomo |
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Institution: | (1) National Institute of Radiological Sciences, Isozaki 3609, 311-12 Nakaminato-shi, Ibaraki, Japan |
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Abstract: | Neutron activation analysis of129I and127I in soil has been studied. The limit of detection for129I in soil was about 0.05 mBq/kg or 1×10–9 as129I/127I atom ratio. The range of129I concentration in surface soils collected around Tokaimura (Ibaraki Prefecture) was 0.9–41 mBq/kg.Tracer experiments on the adsorption of iodine were also carried out, in order to obtain information on the behaviour of iodine in soil-water systems. Different adsorption patterns of iodide and iodate on soil were found. It was supposed that iodide was adsorbed by the soil fraction which became unstable at about 200° C and iodate by the fraction which was relatively stable to heating. |
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