固相萃取微沉积法快速测定生物和土壤中锕系核素

Rapid Determination of Actinides in Organisms and Soil by Solid Phase Extraction Micro-deposition

环境样品中锕系核素(镎-237、钚-239、钚-240和镅-241等)的分析测定是环境保护和放射性核素安全评价的关键环节。本文详细介绍了一种固相萃取微沉积法测量土壤和生物中锕系核素的快速分析方法,利用TEVA树脂、UTEVA树脂和DGA树脂串联的方法对锕系核素进行分离,利用微沉积技术对锕系核素进行富集,采用高分辨率α谱仪进行测量沉淀源,利用镅-243和钚-242作为示踪剂来校正待测核素的回收率。同时对相关实验条件进行分析研究,确定了淋洗液的体积为30 mL。当测量时间为100000 s,样品质量为0.5 g时,本方法的探测下限为0.14 Bq/kg,满足生物和土壤样品中的锕系核素测量要求。

The determination of actinides(Np-237, Pu-239, Pu-240 and Am-241) in environmental samples is a key link in environmental protection and radionuclide safety assessment. In this paper, a rapid method for the determination of Actinide radionuclides in organisms and soil by solid phase extraction micro-deposition was described in detail. The Actinides were separated by a series of TEVA, UTEVA and DGA resins andwere enriched by micro-precipitation. High resolution α spectrometer was used to measure the precipitation source, and americium-243 and plutonium-242 were used as tracers to calibrate the recovery of nuclides. It provided favorable conditions for further analysis and measurement of Actinide radionuclides. When the measuring time was 100000 s and the amount of sample was 0.5 g, the minimum detectable activity concentration of this method was 0.14 Bq/kg, which met the requirement of Actinide radionuclides analysis in organisms and soil sample.