【摘要】 采用α能谱示踪法进行了大气气溶胶中的210Po分析方法研究。气溶胶滤膜样品经剪碎后加入209Po示踪剂,在硝酸-硫酸-高氯酸体系中湿式消化,用0.5 mol/L盐酸反复浸取,在高温高速搅拌的水浴中置入银片自沉积,样品源银片在α能谱仪上测量。建立的分析测量方法,对于采样体积大于500m3的气溶胶样品,探测下限可达0.01 m Bq/m3,回收率接近95%。本方法经多项质量控制措施验证,现已在国家辐射监控点大气气溶胶测量和铀矿污染源监测项目中得到应用。更多还原

【Abstract】 The monitoring of210 Po in aerosol is an important item for the environmental radiation protection. The alpha spectrum tracer method was employed in present work. In the sample treatment,the aerosol samples were first cut into pieces and mixed with standard209 Po as tracer then wet-digested by nitric acid,sulfuric acid,perchlorate acid system and extracted with 0. 5 mol / L hydrochloric acid,finally auto deposited on silver in high temperature and high-speed stirring water bath. The developed method has been tested by several quality control systems,and widely used in atmospheric aerosol measurements of national controlled radiation monitoring points and in pollution source monitoring of uranium mine projects.更多还原