Abstract
Dosimetry system 2002 (DS02) has been established according to the collaboration among many institutions and universities in US, Japan and Germany. DS02 calculates organ doses of atomic bomb survivors. At first emitted neutron and gamma-ray energy spectra from the Hiroshima and Nagasaki atomic bombs were calculated and were used to calculate air transport, absorption and transmission through Japanese houses. Finally organ doses of each atomic bomb survivor were obtained. On the other hand bricks and roof tiles were collected and gamma-ray doses were measured. Similarly iron, granite and copper samples were collected and neutron induced radioactivities such as Co-60, Eu-152, Cl-36 and Ni-63 were measured. The measured data were compared with DS02 and its accuracy was verified. These doses will be combined with the epidemiological studies of the Radiation Effects Research Foundation and the radiation risks were obtained. The risks will be used to limit exposure for radiation workers and also for general people. The major part of the radiation of DS02 is gamma rays, which were increased about 10% both in Hiroshima and Nagasaki comparing with the former DS86. In this paper obtained results of DS02 and the background of the construction of DS02 are shown. Among those data only Co-60 data were not agreed with DS02 at the longer distances. Here we introduce new Co-60 measurements, of which data show good agreement with DS02 at longer distances.
