中文摘要：

论文设计了内陆水体中放射性核素连续在线监测系统,并采用蒙特卡罗方法对系统参数进行了优化。论文通过计算131I、137Cs、60Co在不同水体厚度下探测灵敏度,结合系统造价,确定了系统最优化探测体积,并依据四川省水体中天然放射性核素浓度,计算了131I、137Cs、60Co的判断限、探测限和定量限,该结果为内陆水体中放射性核素连续在线监测系统构建提供了技术参考和依据。

英文摘要：

This paper designs an online continuous water radioactivity monitoring system and takes Monte Carlo simulation results to optimize design of the system parameters. This paper calculates the sensitivity coefficients of 131I ,137 Cs, 60Co under different water thicknesses and determines the optimal system volume in consideration of cost. According to Sichuan province natural radionuclide concentration, this paper obtains the decision thresholds, detect limits and quantification limits of 131I ,137 Cs, 60Co. These results will provide technical reference for constructing an online continuous water radioactivity monitoring system.