[M-AG44] 福島原発事故により放出された放射性核種の環境動態

[MAG44-05] 福島第一原発事故後の土壌, 河床, ため池堆積物中の²³⁷NpとPu同位体比

*福田 美保¹、鄭 建¹、山崎 慎之介¹、青野 辰雄¹ (1.量子技術研究開発機構　放射線医学総合研究所)

キーワード：福島第一原発事故、ネプツニウム、プルトニウム、セシウム

In this study, we report ²³⁷Np and Pu isotopes in soil, riverbed and reservoir sediments after the Fukushima Dai-ichi Nuclear Power Station (FDNPS) accident. ²³⁷Np activities in these samles were (0.013±0.02)~(5.7±1) mBq/kg-dry and were one to three orders of magnitudes low compared to these previous reports before the FDNPS accident even considering radiation decay. ²³⁷Np activities were generally three orders of magnitude lower than those of ^239+240Pu activities. We will also report ²³⁷Np and Pu isotopes activity and atomic ratio and what we learn from them and relationship between these transuranic elements and Cs isotopes.
This work was partially supported by Research and Development to Radiological Sciences in Fukushima Prefecture.