LONG-RANGE ATMOSPHERIC TRANSPORT OF RADON IN EAST ASIA AND DEPOSITION OF ITS PROGENIES IN JAPAN

A three-dimensional long-range atmospheric transport model for Rn-222 and its progenies was applied to simulate Pb-210 deposition in Japan and its adjacent waters. Monthly precipitation and Pb-210 deposition simulated by the model for winter months were favorably compared with observational data although they were exceptionally underestimated in Aomori. The large monthly deposition along the Japan Sea coast lines during winter was successfully simulated by the model to be nearly 200 Bq m(-2), which was contrasted by about 10-fold smaller deposition in other regions. It was also pointed out that the heavy deposition areas formed a narrow band structure along the coastline with width of several tens of kilometers and Pb-210 deposition amount positively correlated with the height of mountains located leeward of the heavy deposition areas.