摘要
１９８１～１９９３年对我国农用硝酸稀土样品的天然放射性进行了监测，查明农用稀土化合物中主要的天然放射性成分是：￣（３２２）Ｔｈ，平均含量为５４．９Ｂｑ·ｋｇ￣（－１）。通过１０年定位试验和两年喷施不同放射性活度稀土的田间试验，均未检测出土壤中天，铁放性活度的变化，也测不出作物体中α、Ｕ和￣（４０）Ｋ活度增加的趋势，仅作物茎叶￣（２３２）Ｔｈ活度有增加。施用硝酸稀土后，农产品中放射性物质含量未超过国家标准规定限制值。
The natural radioactivity of rare earth nitrate used in agriculture was determined during1981～1993.It demonstrated that232Th was the main component of those and the averagecontent was 54.9 Bq/kg The ten-year fixed position experiments and the two-year field ex-periments by spraying rare earth with different radioactivity did not show any alterations ofnatural radioactivity in soil and the rising trends of α,U and 40 k in crops.The radloactivityof 232Th increased slightly in stems and leaves of crops。
出处
《核农学报》
CAS
CSCD
1995年第3期163-167,共5页
Journal of Nuclear Agricultural Sciences
关键词
农用稀土
天然放射性核素
污染
土壤
作物
Rare earth in agriculture, radioactive pollution,environment
