@misc{oai:repo.qst.go.jp:00071505,
 author = {S.K.Sahoo and S.Mishra and H.Arae and A.Sorimachi and M.Hosoda and S.Tokonami and T.Ishikawa and 新江 秀樹 and 石川 徹夫},
 month = {Sep},
 note = {An extraordinary earthquake of magnitude 9.0 followed by Tsunami on 11 March 2011 caused serious nuclear accident occurred at the Fukushima Daiichi Nuclear Power Plant (FDNPP) about 250 km north to Tokyo, capital of Japan. This has resulted radioactive contamination in a large area due to deposition of long-lived radionuclides. Contaminated soil can cause an enhanced radiation exposure even after many years and depending upon environmental conditions can be mobilized to aquatic systems. Therefore, the fate and transfer of these radionuclides in the soil water system is very important for radiation protection and dose assessment. In the present study, emphasis has been given on isotope ratio measurement of uranium which can give us the idea about its contamination during accident. Soil and water samples were collected from contaminated areas around FDNPP. Inductively coupled plasma mass spectrometry (ICPMS) is used for total uranium concentration and thermal ionization mass spectrometry (TIMS) has been used for uranium isotopes measurement. Extraction chromatography has been used for the separation of uranium.  We have observed, isotope ratio 235U/238U is of natural origin, however in a few soil samples 236U has been detected. For the migration behavior, its distribution coefficient (Kd) has been determined using laboratory batch method. Depleted uranium is used as tracer for uranium Kd estimation. Chemical characterization of soil with respect to different parameters has been carried out. The effect of these soil parameters on distribution coefficient of uranium has been studied in order to explain the radionuclide mobility in this particular area. The distribution coefficient values for uranium are found to vary from 30-35679 L/Kg. A large variation in the distribution coefficient values shows the retention or mobility of uranium is highly dependent on soil characteristics in the particular area. This variation is explained with respect to pH, Fe, Mn, CaCO3 and organic content. There is a very good correlation of uranium Kd obtained with Fe content. There is a variation with uranium activity ratio where as no enrichment of 235U has been noticed in the studied area. However contaminated water used for cooling the reactor vessel stored near the reactor after accident, may contain radioactive uranium. Therefore, it is of a concern to understand leaching of U in the groundwater system. In that context, this study will be very much useful., International Conference on RADIOECOLOGY & ENVIRONMENTAL RADIOACTIVITYに参加し、ESTIMATION OF URANIUM ISOTOPES IN SOIL AFFECTED BY FUKUSHIMA NUCLEAR POWER PLANT ACCIDENT AND ITS MOBILITY BASED ON DISTRIBUTION COEFFICIENT AND SOIL PROPERTIESの発表を行う},
 title = {ESTIMATION OF URANIUM ISOTOPES IN SOIL AFFECTED BY FUKUSHIMA NUCLEAR POWER PLANT ACCIDENT AND ITS MOBILITY BASED ON DISTRIBUTION COEFFICIENT AND SOIL PROPERTIES},
 year = {2014}
}