[3C01-09] Environmental Radiation Monitoring

10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)

[3C04] The Progress and Future Prospects of Environmental Radiological Monitoring by Japan Atomic Energy Agency(4) Advances in Underwater Monitoring

*Kotaro Ochi¹, Kazuya Yoshimura¹, Yukihisa Sanada¹ (1. JAEA)

Keywords:

Underwater monitoring,Fukushima Daiicni Nuclear Power Station,In-situ measurement,Radiocesium distribution

After the TEPCO Fukushima Daiichi Nuclear Power Station accident in 2011, bottom sediment with adsorbed radiocesium has accumulated in some ponds and dam lakes. To determine the distribution of radiocesium in bottom sediment, it is complicated to collect bottom sediment samples, conduct pretreatment, and then analyze the samples for radioactivity. JAEA has been developing an in-situ measurement technique of radiocesium in bottom sediments using a water-resistant radiation detector to evaluate the distribution of radiocesium in bottom sediments quickly and easily. In this presentation, we will report on the in-situ measurement techniques we have developed for the bottom of water in ponds and dam lakes, as well as examples of how the measurement techniques have been used in decontamination planning and other activities in actual ponds.