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放射源的射线计数随时间而涨落．利用物质对射线的吸收原理来测量或控制物质流量时，它将产生测量误差与控制不稳．本文讨论了这种涨落与误差的关系，（１）首先从分析放射源涨落规律开始，然后找出项目测控系统中产生的有无物料判断误差与瞬时流量跳字误差，按照国际建议规定，巧妙地运用编程方法解决了工程中的这一实际问题；（２）给出为了达到系统设计目标所进行的放射性计数判断决策与数据处理技术的方法，同时结合一个工业现场实例给出了相应软件设计方法
Radiation source radiation count fluctuations over time. When measuring or controlling material flow using the principle of material absorption of rays, it produces measurement errors and unsteady control. This paper discusses the relationship between fluctuation and error. (1) Firstly, starting with the analysis of the fluctuation of radioactive sources, and then finding out whether the material judgment error and instantaneous flow jump error occurred in the project measurement and control system, according to the international recommendations , Skillfully use programming method to solve this practical problem in the project; (2) given in order to achieve system design goals for radioactive counting decision-making decision and data processing techniques, combined with an example of an industrial site gives the corresponding Software design method