开展对放射性核素及其化学形态的分析研究，是评价环境中放射性危害水平的有效途径，也是环境监测过程中必不可少的环节。本项目针对长寿命裂变产物Tc-99的核化学特性, 集中研究环境样品中Tc-99及其不同化学形态的分析方法；建立可用于常规及事故状况下Tc-99的分析流程；阐明Tc-99在环境中的化学行为；揭示Tc-99在地质环境中的迁移、扩散规律；为我国高放废物地质处置及放射性核素安全评价提供必要的基础理论和科学依据。

Studying on the analysis of radionuclide and its chemical speciation is an effective way of evaluating the level of radiological hazards in the environment. It is also an essential part during environmental monitoring process. The present project focuses on the long-lived radionuclide Tc-99 and its chemical speciation analysis according to the nuclear chemical properties of Tc. Procedures for determination of Tc-99 in environmental samples in routine and emergency situation will be developed. The objective is to clarify the chemical behavior of Tc-99 and its migration and diffusion law in the environment, and provide the necessary basis for the theoretical and scientific basis for the repository design and the safety assessment of the high-level radioactive waste repository of China.