广东大亚湾沿海地区生态环境中^(90)Sr含量水平调查

INVESTIGATION OF ^(90)Sr ACTIVITY LEVEL OF DAYA BAY COASTAL AREAS IN GUANGDONG

本文介绍了１９８８－１９９２年广东大亚湾沿海地区生态环境中￣（９０）Ｓｒ含量水平调查的方法和结果。本次调查分两期进行，在东西宽８０ｋｍ的范围内，共布设了１１５个采样点，采集了２３个品种，３９９个样品。调查结果表明：（１）大气飘尘和雨水的￣（９０）Ｓｒ含量平均值分别低于各自的检测限：４×ｌ０￣（－７）Ｂｑ／ｍ￣３和４×ｌ０￣（－４）Ｂｑ／Ｌ；（２）饮用水和海水中的￣（９０）Ｓｒ含量平均值分别为１．４×ｌ０￣（－３）和２．６×１０￣（－３）Ｂｑ／Ｌ；（３）果园土、菜地土、稻田土和水库底泥中￣（９０）Ｓｒ含量的平均值分别为０．０７７、０．４２、０．７２和０．８４Ｂｑ／ｋｇ（干）；（４）陆上植物中以空心菜中￣（９０）Ｓｒ含量最高，平均值为０．５１６Ｂｑ／ｋｇ（鲜），大米和荔枝中的含量最低，平均值分别为０．０１７和０．０１２Ｎｑ／ｋｇ（鲜）；（５）猪肉、鸡和牛奶中￣（９０）Ｓｒ的含量较低且相接近，平均值为０．０１７Ｂｑ／ｋｇ（鲜）左右。鱼中的含量较高，平均值为０．１５７Ｂｑ／ｋｇ（鲜）。

This paper described the methods and results of investigation on strontium-90activity level in Guangdong Daya Bay coastal ecologic environment from l988 to l992. In thisinvestigation, 399 samples of 23 environmental mediums were obtained at 115 points over aarea of width of 80 km from east to west.The results show that (l)The ￣(90)Sr content of theatmospheric dust and the rain water are lower than the detection limits , 4×l0￣(-7)Bq/m￣3 and 4/10￣(-4)Bq/L, respectively;(2) The average ￣(90)Sr content of drinking water is l.4 × 10￣(-3)Bq/L, and that of sea water is 2.6×10￣(-3)Bq/L; (3)The average of the reservoir mud, therice field soil, the vegetable field soil and the fruit field soil are 0.84,0.72,0.42 and 0.077Bq/kg(dry),respectively;(4) In the land plants,the ￣(90)Sr content fo water spinach is high-est with an average of 0.516Bq/kg(fresh), and that of rice and lichee are lowest with aver-ages of 0.017 and 0.0l2Bq/kg(fresh), respectively;(5) The ￣(90)Sr content of the pork,chicken and milk are low and approach each other with averages about 0.0l7Bq/kg(fresh),but that of fishes is higher with average of 0.157Bq/kg (fresh)。