Development of an estimation method of concentration distribution and release amount of radionuclide discharged to the atmosphere using gamma-ray imaging, 2; Calculation of radionuclide concentration distribution in the atmosphere

Nakayama, Hiromasa   ; Satoh, Daiki   ; Furuta, Yoshihiro; Nagai, Haruyasu  

We have been developing a method for estimating radionuclide concentration distributions in the atmosphere and release amount by combining atmospheric dispersion simulations with radiation measuring. This method has high potential to improve reliability of the simulation accuracy by incorporating the obtained release amount and concentration distributions near a source point into atmospheric dispersion simulations. Because there are no real data on radionuclide concentrations, we have a plan to calculate the test data on radionuclide concentration distributions in the atmosphere by computational simulation and validate the estimation method. In this study, we report the method for calculating them used for the test data.