Study of soil particles contaminated with radioactive cesium in pond sediment

Cogent Engineering

Tohru Ohnuma¹  Keizo Ishii¹ 

[1] Research Center for Remediation Engineering of Living Environments Contaminated with Radioisotopes, Graduate School of Engineering, Tohoku University, 6-6-01-2, Aramaki Aza-Aoba, Aobaku, Sendai, Miyagi 980-8579, Japan;

关键词: cesium radioisotopes;    cesium 137;    Fukushima Daiichi NPP;    contaminated soil;    radioactivity distribution;    pond sediment;    rainfall erosion;   

DOI  :  10.1080/23311916.2019.1662573

来源: Taylor & Francis

【 摘 要 】

The Fukushima Daiichi Nuclear Power Plant accident caused by the tsunami following the Great East Japan Earthquake in March 2011 resulted in contamination in Namie and Iitate, located in Fukushima Prefecture. These villages are in mountainous areas where achieving decontamination by removing soil is difficult. However, washout by rain is expected. The mountainous land is eroded by rainfall, so the soil will flow out into rivers and ponds. We assumed that polluted soils would have accumulated in ponds, and investigated the sediment to evaluate the mountain decontamination ability of rainfall. Although the surface of the pond sediment was radioactive, highly contaminated layers that were expected to have formed due to heavy rain immediately after the accident were not found. We recognized that the separation of the contaminated soils based on the particulate mean size was carried out in the pond.

【 授权许可】

CC BY