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Vol. 51 (2016) No. 4 p. 209-217




A large amount of contaminated rubbles were generated by the accident at the Fukushima Daiichi Nuclear Power Station (F1NPS). For safe decommissioning of F1NPS, it is important to evaluate the composition and concentration of radionuclides in the rubbles. In this paper, to characterize the rubbles collected at F1NPS, radiochemical analysis was operated. As a result of radiochemical analysis, gamma-ray-emitting nuclides 60Co, 137Cs and 154Eu, beta-ray-emitting nuclides 3H, 14C, 90Sr and 99Tc, and alpha-particle-emitting nuclides 238, 239+240Pu, 241Am and 244Cm were detected. In contrast, 94Nb and 152Eu concentrations were below the detection limit. Measured radioactive concentrations implied that 60Co and 90Sr concentrations depended on 137Cs concentration respectively. This analysis was characterized the radioactivity concentrations of the rubbles.

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