An evaluation of personal dosimeter for widely distributed 134Cs and 137Cs by using EGS code

Personal dosimeters used at Fukushima et al. to measure exposure dose of individuals was studied by using electron photon Monte Carlo code EGS 5. Personal dosimeters are used to measure the operation quantity, Hp(10). However, in the case of exposure from radionuclide like 134Cs or 137Cs distributed widely near the ground surface, photons enter to the human body with mainly slightly small angle than 90 degrees uniformly from all directions. From this study, it was found that the recorded dose in personal dosimeter was corresponding to equivalent dose as the results. (author)