【摘要】 采用NaⅠ(T1)低本底"能谱分析仪,对宝鸡燃煤电厂粉煤灰及模拟土壤样品中的天然放射性核素进行了分析。结果表明,粉煤灰中天然放射性核素226Ra、232Th、40K的比活度分别为:63.31～165.09Bq·kg-1,平均108.64Bq·kg-1;95.35～173.57Bq·kg-1,平均141.00Bq·kg-1;193.49～502.31Bq·kg-1,平均354.94Bq·kg-1。农田模拟试样研究表明,土壤中天然放射性核素的比活度和地面1m高处空气γ剂量率及地面γ辐射所致人均年有效剂量当量随粉煤灰的施用量增加呈现增加的趋势。因此,对粉煤灰的农田施用要加强管理和监测。更多还原

【Abstract】 The most important naturally occurring radionuclides present in soil,coal,rock and other materials are 226Ra,232Th and 40K.The contents of natural radionuclides differ with different kinds of coals.The most natural radionuclides concentrate into fly ash when coal burned.The fly ash is the main solid waste of coal-fired power plant.The analysis of fly ash samples from Baoji thermal power station shows the contents of natural radionuclide 226Ra,232Th and 40K range from 63.31 to 165.09 Bq·kg-1 with average 108.64 Bq·kg-1,95.35 to 173.57 Bq·kg-1 with average 141.00 Bq·kg-1 and 193.49 to 502.31 Bq·kg-1 with average 354.94 Bq·kg-1,respectively.The results of simulated experiment with applied fly ash show that the specific activity of 226Ra,232Th and 40K in treated soil,the gamma dose rate in the outdoor air at 1 m above the ground level and annual effective dose increase with the increasing amount of applied fly ash in farmland.So,the farmland applied with fly ash should be managed and monitored.更多还原