@misc{oai:repo.qst.go.jp:00083713,
 author = {Murugan, Rajamanickam and Kumar Sahoo, Sarata and Sorimachi, Atsuyuki and Aono , Tatsuo and Murugan, Rajamanickam and Sahoo, Sarata and Tatsuo, Aono},
 month = {Sep},
 note = {The Fukushima Dai-ichi Nuclear Power Station (FDNPS) accident caused a significant amount of 137Cs deposition in the Fukushima prefecture. In the present study, soil samples collected from the Namie-machi area with radiocesium contamination were considered. The 137Cs activity concentration of the soil samples ranged from 18 - 469 kBq/kg.
MOX fuel was used in the FDNPS reactor. There may be spread of small amount of actinides into the environment as a result of partial melt-down of the reactor cores. It is a challenging task to distinguish between anthropogenic and natural U, since U abundances vary in Japan soils from 3.67-42.4 Bq/kg. Measurement of 235U isotope could play an important role to identify the source of contamination whether it is from FDNPS accident. Therefore, uranium activity ratio (234U/238U) and 235U/238U ratio in the soil samples were measured using multi-collector inductively coupled plasma mass spectrometry. 
The retention or mobility of radionuclides in soil is highly dependent on its distribution coefficient value. In our Kd studies, the U distribution coefficient value range was very high compared to the distribution coefficient of Cs in Fukushima soil samples (Mishra et al., 2019). 
The relationship between 137Cs activity concentration and U isotope ratio of soil sample are important to establish radionuclides dynamic in the environment after any accident. This can give information about the source of radionuclides released and the extent of damage and meltdown of reactors, which is still unclear at present. Further results will be presented in the meeting., Environmental Dynamics of Radionuclides and Biological Effects of Low Dose-Rate Radiation},
 title = {Activity ratio of uranium in Fukushima soil samples using multi-collector inductively coupled plasma mass spectrometry},
 year = {2021}
}