Correlation between natural radiation exposure and cancer mortality. 3.

概要

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In the previous study, a statistically significant positive correlation between natural background radiation exposure rates and crude (non-age-adjusted) cancer mortality rates was observed in 46 Japanese prefectures over the period from 1968 until 1978. However, the significance of this correlation mostly disappeared through age adjustment. It was suggested that natural radiation levels are positively correlated with population component ratios older than 40, 50 and 65 years, which was considered to be one of the causes of the apparent correlation between exposure rates and crude cancer mortality rates.<BR>In order to confirm these facts, we also examined the correlation between natural background radiation exposure rates and cancer mortality rates over two other periods : 1950-1957 and 1958-1967. Furthermore, we carried out a long-term analysis for the period 1950-1978, including the data of the previous report. In all periods, statistically significant positive correlation coefficients were observed in most cases of cancer with only a few exceptions. However, as in the previous study, the significance of the correlation mostly disappeared through age-adjustment with only one exception of uterine cancer in 1958-1978.
日本大学歯学部の論文