Abstract
Fallout 137Cs from atmospheric nuclear detonation tests has been worldwide transported in the environment and finally taken by human through various pathways. In particular, dietary uptake pathways are very important for evaluating the human health risks by long-term global low level radioactive contamination. In this study, the global 137Cs food contamination model containing various possible pathways to total dietary uptake by Japanese is proposed by improving the model reported in the preceding symposium. The model includes the pathway through the foods import from all over the world. The proposed model was examined by comparing thenumerical simulation results with the monitoring data of 137Cs in Japanese total diet and the Japanese healthrisk at each age group was evaluated. The health risk caused by the 137Cs dietary intake was compared with that by the90Sr or 3H dietary intake. The main results obtained in this study are as follows:
(1) The proposed model is promising for evaluating the Japanese dietary intake of global radioactive fallout 137Cs.
(2) The main pathway of Japanese dietary intake of 137Cs is the that through the farm products.
(3) The Japanese health risks induced by 137Cs dietary intake was estimated at maximum about 8 persons annual excess death per 100 million in 1960's; the risk of the infants is the highest.
