[1H10-13] Radionuclide Inventory

[1H13] Inventory evaluation in waste using soil near Fukushima Daiichi Nuclear Power Station

*Kenso Fujiwara¹, Kazuki Iijima¹ (1. JAEA)

Keywords:radionuclide inventory, concentration profile, soil near 1F

The concentration of nuclides other than Cs diffused by the Fukushima Daiichi Nuclear Power Station (1F) accident is very low in the environment, and it has been confirmed the concentration of Pu etc. is about the fallout. On the other hand, it has become clear that the nuclides derived from the accident can be evaluated from the distribution of radionuclides in the soil. So inventory evaluation in soil can be expected by measuring the concentrations of Pu and fission products such as Sr and Cs and grasping the nuclide concentration derived from 1F. In this study, the soil outside the specified nuclear facility located on the south side of the 1st floor was sampled with a scraper plate to a depth of about 15 cm every 1 cm, and Cs-134 and 137 were measured by γ-ray measurement, and Sr-9 and α-ray were measured by β-ray measurement. The concentrations of Pu-238, Pu-239 + 240, Am-241, and Cm-244 were determined by. 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.