四平市区土壤中氡的分布规律

DISTRIBUTION PATTERN OF THE RADON IN SOIL OF SIPING CITY,JILIN PROVINCE,CHINA

在国内对测量天然条件下城市土壤中氡还为数不多的情况下 ,利用静态活性炭吸附法 ,对四平市区土壤中氡进行了测量 ,分析了四平土壤中氡的分布规律。区内土壤中氡浓度的变化范围为0 .1～ 4 6 .7Bq/l,个别点测值高出世界土壤中氡浓度平均值 (7.4Bq/l)的 8.6倍。根据土壤中镭的含量计算了空气中氡的变化规律 ,在距地表 1m高的空气中氡浓度平均值为 3.5 4Bq/l,此值在世界正常值范围 (1～ 10Bq/l)

The radon contents in soil in the city of Siping is measured by the absorb method of the static active char, which is still a few mensuration of the radon in soil in nature condition in China. The concentration of the radon is determined. The distributive low of the radon in soil is discussed. The range of concentration of radon is 0.1～46.7 Bq/l. But, the value determined in soil at one or two observing point is 8.6 times more than the average(7.4 Bq/l) in the world. The evolution trend of the radon in airspace is calculated base on radium contents in soil. The average concentration of radon is 3.5Bq/l in 1 m airspace above the ground surface, which is in the range of normal value(1～10 Bq/l) in the world .