Cancer risk evaluation due to radiation exposure considering smoking cohort effects

Shimada, Kazumasa ; Kai, Michiaki*

The latest atomic bomb survivor life span study (LSS) reported that cancer risks due to radiation are increased with smoking synergistically. Therefore, it is important for radiation risk estimation to consider the information of smoking habit. However, current method of radiation risk estimation are not considered with age and sex but considered with smoking habit. Then, this method may overestimate the risk of radiation for non-smokers. For this reason, we estimate cancer risk due to radiation considering smoking cohort effect (information of smoking rate and quitting smoking) and evaluate the effects of smoking information for risk evaluation. In this research, it is important for estimation of non-smoker baseline risk to consider the information of smoking habit for over 50 years old when their cancer risk increase.