Estimation of radionuclide concentration in plume using pulse height distribution measured by LaBr₃ scintillation detector and its response to radionuclides in plume calculated with egs5

A method was presented to estimate radionuclide concentration in plume using the pulse height distribution measured by a LaBr₃ scintillation detector and its calculated response to radionuclides in plume with egs5. Radionuclide concentration was estimated from the ratio between the peak count rates corresponding to each radionuclide in the measured pulse height distribution on an expressway on March 15 and in the calculated one from each radionuclide in plume using the egs5 Monte Carlo code. The pulse height distribution reconstructed based on the estimated concentrations agrees well with the measured one at the time that the contribution from radionuclides deposited on a ground surface is negligible. (author)