符合软件参数设置对^(60)Co测量结果的影响研究

Study on the influence of software parameter setting on ^(60)Co measurement results

^(60)Co为核电站放射性物质之一,为满足国家环保要求,对放射性核素进行精确测量显得尤为重要。文章基于4πβ(PC)-γ符合绝对测量系统和数字符合软件,在测量放射性核素^(60)Co时,根据探测器记录的β和γ脉冲分析研究了β下阈、符合分辨时间、β延迟时间、γ能窗和死时间等五个参数的设置对于符合外推测量结果的影响,确立了^(60)Co测量最优化外推参数。基于最优化测量参数,实现对^(60)Co核素活度的绝对测量,测量值与参考活度偏差为0.1%。

60Co is one of the radioactive materials in nuclear power plants.It is especially important to accurately measure radionuclides in order to meet national environmental protection requirements.Based on the 4πβ(PC)-γ in accordance with the absolute measurement system and the digital compliance software,when measuring the radionuclide 60Co,the β lower threshold,the coincidence resolution time,the β delay time,and the γ are studied according to the β and γ pulse records recorded by the detector.The setting of five parameters,such as energy window and dead time,establishes the 60Co measurement optimization extrapolation parameter for the influence of the extrapolation measurement results.Based on the optimized measurement parameters,the absolute measurement of the 60Co nuclide activity is achieved,and the measured value and the reference activity deviation are 0.1%.