Inventory evaluation in waste using soil near Fukushima Daiichi Nuclear Power Station

Fujiwara, Kenso ; Iijima, Kazuki  

Regarding the waste generated by the decommissioning process of the 1F, it is necessary to grasp the properties such as inventory. In order to contribute to understanding the properties of radionuclides, the concentrations of transuranium elements and fission products in the soil will be measured. By considering the diffusion effect from the concentration distribution of nuclides in the depth direction, the ground surface inventory evaluation can be expected. In this study, the soil outside the specified nuclear facility located on the south side of the 1F was sampled with a scraper plate to a depth of about 15 cm every 1 cm, and Cs-134 and 137 were measured by gamma-ray measurement, and Sr-90 and were measured by beta-ray measurement. The concentrations of Pu, Am, and Cm were determined by alpha-ray. The nuclide profile obtained was converted into the nuclide concentration deposited on the surface at the time of the accident, and inventory evaluation was performed.