In order to examine the difference in life span between the radiation-related cancer and the spontaneous cancer, the cases of cancer which occurred in the life span survey (LSS) group in Radiation Effects Res. Foundation were analyzed. The cases of cancer were divided into first half (1958-1975) and latter half (1976-1995) by the diagnosis year, and the subjects having an adult healt study (AHS) of once in two years were compared with those having no study in the LSS group. The subjects having AHS showed a tendency to have a longer life span than those having no AHS, and especially, this tendency was remarkable in the first half of the investigation. It is considered that this is because AHS lead to the early diagnosis of the cancer, and the height of therapeutic ratio with early diagnosis contributed to the extension of the life span. Though in this research, the relationship between life span and exposure dose was not made clear, it is considered that the participation of Radiatio...
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