人类核活动产生的129I一旦释放到环境中将长期保留。129I可以作为核环境安全长期监测的有效工具。随着我国发展核电速度的加快，尽快建立放射性核素(如129I)示踪我国核环境安全的方法十分重要。本项研究拟通过环境样品制备方法研究，以高精度129I-AMS测试技术为基础，分析我国正在运行的一个核电站周边环境样品129I含量与水平，并与远离核电站的不同区域环境样品进行对比，分析核电站周边环境样品中129I的不同来源，研究其周边环境安全性。所建立的不同类型样品的系统检测方法将为核环境安全监测提供新的手段，为已运行核电站开展核监测、在建、规划建设的核电站与核燃料后处理基地未来运行时开展核监测、以及我国周边国家核活动监测提供基础背景数据。

Iodine is a volatile element and easily to be reseased from the nuclear reactor when the nuclear fule is broken and leaked in the incidence condition, and the long half life of 129I allows it remain in the environemnt for long term when released, these features make 129I an ideal indicator radionuclide to monitor the environmental safety. With the fact that nuclear power is now rapidly developing in China, it is essential to conduct nuclear environmental tracing studies using radionuclides such as 129I.This project aims to develop sample preparation method for 129I analysis, to be used to determine 129I in environmental samples around an operating nuclear power plant based on high sensitive AMS measurement technique. Samples remote from the NPP will be also analyzed for data comparision. Through data analysis and comparison, it will be able to evaluate the source of 129I in the environment and effectively assess the nuclear environmentsafety around this nuclear power plantThe project intend to develope a new tracing tool for nuclear environmental monitoring reaserach.In addition, the data obtained in this project can be used as a baseline data for radioactivity monitoring around operating NPP as well as for NPPs under construction and planed NPP and NFRP in the future.