【摘要】 对浙江、福建、山东、江西、安徽和江苏 6省部分大型热电厂粉煤灰的采样分析表明 :粉煤灰中主要放射性成分为2 38U、2 32 Th衰变系和4 0 K ,比活度范围分别为 75～2 84Bq kg、60～ 1 64Bq kg和 1 2 0～ 73 8Bq kg。粉煤灰农田施用模拟试验表明 :当施用量达到 52 5t hm2 时 ,土壤中天然放射性核素2 2 6 Ra和2 2 8Ra的比活度分别是对照的 1 88倍和 1 3 9倍 ;生产的食品 (稻谷、玉米籽和麦粒 )中 2种核素的比活度与对照没有明显差异 ,对作物的食用安全性影响不明显更多还原

【Abstract】 Sampling from the electric power plants of Zhejiang, Fujian, Shandong, Jiangxi, Anhui and Jiangsu, 16 coal ash samples were measured respectively by HPGE γ spectrometer analyzer. The results showed that the main composition of radioactive nuclide are 238 U, 232 Th, their daughter nuclides and 40 K.The activity ratio of 238 U, 232 Th and 40 K ranges from 75Bq/kg to 284Bq/kg, from 60Bq/kg to 164Bq/kg and from 120Bq/kg to 738Bq/kg, respectively. The simulated experiment on coal ash used to farmland showed that the activity ratio of natural radioisotope 226 Ra and 228 Ra in the simulated soil were 1\^88 and 1\^39 times higher than those in ordinary soil respectively when amount of the coal ash used was up to 525t/hm\+2. The activity ratio of two nuclides in crop (rice,maize and wheat seed) grown in the farmland applied with coal ash and those of the ordinary farmland have no evident difference. The effect of edible security is not evident.更多还原