Base Information Q&A SiteJAEA

Radioactivity Dynamics in River System

(2017)

Which parts of the river is radioactive cesium more likely to accumulate? 【Example of analysis】

Observations show that sediment contaminated with radioactive cesium is accumulated in large amounts on downstream dry riverbeds and that the distribution of such sediment is uneven.
We performed a simulation to understand the mechanism of this phenomena and reproduced the tendency that radioactive cesium is more likely to accumulate in curved parts of the river.

  • Air dose rates measured by a remote-controlled helicopter in 2013

    Fig.1 Air dose rates measured by a remote-controlled helicopter in 2013

  • Estimated Cs-137 deposition at the time of the September 2015 typhoon, based on simulation

    Fig.2 Estimated 137Cs deposition at the time of the September 2015 typhoon, based on simulation