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。
The most important naturally occurring radionuelides present in soil, coal, rock and other materials are ^236Ra, ^232Th and ,^40K. The contents of natural radionuelides differ with different kinds of coals. The most natural radionuelides 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 radionuelide ^236Ra, 2UTh 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·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 ^236Ra, ^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.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第1期273-276,共4页
Journal of Agro-Environment Science
基金
新世纪优秀人才支持计划项目(NCET-05-0861)
陕西省自然科学基金项目(2006D14)
关键词
粉煤灰
农业生态环境
天然放射性
fly ash
agriculture eco-envimnment
natural radioactivity
