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The experts used a model known as fractional diffusion to come up with a longer-term prediction for the 137Cs concentration in both the lake water and pond smelt, a typical fish that lives in the lake. The experts used a model known as fractional diffusion to come up with a longer-term prediction for the 137Cs concentration in both the lake water and pond smelt, a typical fish that lives in the lake Some other estimates have suggested the final cost may approach $1 trillion and the recovery could last as long as 40 years.Īccording to the Environmental Protection Agency, Cesium-137 has a fairly long half-life, at approximately 30 years.Įxposure to the radioactive isotope can cause burns, radiation sickness and death, while also increasing the risk for cancer. In 2016, the Japanese government raised its official projections for costs related to the nuclear disaster to $188 billion. These processes include convection-induced circulation, turbulent mixing, and absorption by plankton and other organisms.' 'Our work is instead based on the fractional diffusion model, a framework that captures the complex diffusion processes occurring in the lake water. 'Previous investigations have used the two-component decay function model, which is the sum of two exponential functions, to fit the measured 137Cs radioactivity concentration,' one of the study's co-authors, Professor Yuko Hatano, said in a statement. Lake Onuma is a closed lake and has a limited amount of inflow and runoff water