抄録
Since 1987 through 1990, we have observed in diurnal and seasonal variation of radon concentration in and out of the house in Shanghai urban district. The equilibrium factor between radon and radon decay products of in- and outdoors environment was estimated to be 0.5 and 0.7 respectively. The indoor radon concentration was estimated to be 9.92±1.66 (GSD) Bq/m3 and the outdoor radon concentration was estimated to be 4.25±1.75 (GSD) Bq/m3 in Shanghai city. The occupancy factor at urban district was estimated to be 0.82 indoors and 0.18 outdoors for adults, 0.87 and 0.13 for children. In 1989 the population-weighted annual effective dose in Shanghai city was estimated to be 0.39mSv, and the annual collective effective dose was 5, 000 manSv, which may cause the excess lung cancer death up to 277 cases among 12, 767, 500 people that accounted for 6.0% of total number of the lung cancer death.
