开展对典型介质中放射性核素的分析研究，是评价放射性危害水平的有效途径，也是核监测过程中必不可少的环节。本项目针对主要裂变产物Se-79，Sr-90及Tc-99的核化学特性,集中研究环境土壤及人体尿样中Se-79，Sr-90及Tc-99的分析方法；通过优化样品前处理、目标核素的分离纯化及质谱测量等环节中的实验条件，结合自动分离系统，建立可用于常规及事故状况下目标核素的分析流程；为环境中放射性核素的安全评价及典型放射性核素对人体的内照射影响评估提供必要的技术支持和方法参考。

Studying on the analysis of radionuclides in typical medium is an effective way of evaluating the level of radiological hazards. It is also an essential part during nuclear monitoring process. The present project focuses on the main fission products of Se-79, Sr-90 and Tc-99 determination in environmental soil and human urine samples according to their nuclear chemical properties. By optimizing the experimental conditions during sample pre-treatment, target nuclides separation and purification, and mass spectrometry measurement, the procedures for determination of Se-79, Sr-90 and Tc-99 in soil and urine samples in routine and emergency situation will be developed through combining the automatic separation system. The objective is to provide the necessary technical support and method reference for the safety assessment of radionuclides in the environment and the internal dose of special radionuclides to human.