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标定伽玛测井仪的标准方法是,首先测定死时间,然后利用美国原子能委员会大约克兴模型站的N-3模型进行测量,根据公式 K=(GT)/A 确定系数 K。本文提出了一种新的方法,使用计算机确定视死时间和系数 K。利用二个具有不同品位和品位-厚度积的模型。在每个模型上作等点距测量,从底部的本底值测至顶部的本底值。利用模型测井的数据导出计算机所需的输入程序。它由每个模型的 GT 值(品位-厚度积)和观测到的计数率组成。设计出了适用于 IBM1401和 IBM1130型计算机的 Fortran 计算程序。这种程序经过不大的修改,即可用于类似的或较大的任何类型的数字计算机。本文所描述的方法,并不是对仪器的真死时间进行计算,而是一种综合效应的死时间校正法。方法的优点在于:1.测定死时间效应的测量几何条件和计数率数值,同野外测井的实际条件相同;2.标定工作既利用了高品位模型,又利用了低品位模型,而不是仅利用一个模型。
The standard method for calibra- tion of a gamma tool is to first determine the dead time and then measure it using the N-3 model of the United States Commission for Atomic Energy Commission at Coxing’s Model Station and determine the coefficient K according to the formula K = (GT) / A. This paper presents a new method that uses a computer to determine the apparent dead time and the coefficient K. Use two models with different grade and grade - thickness products. Make a dot pitch measurement on each model, from the bottom background value to the top background value. Use the data from the model log to derive the computer’s required input routines. It consists of the GT value (grade - thickness product) for each model and the observed count rate. A Fortran program for the IBM 1401 and IBM 1130 computers was designed. This program, with minor modifications, can be used on any type of digital computer of similar or larger size. The method described in this article does not calculate the true dead time of the instrument, but a dead-time correction of the combined effect. The advantages of the method are: 1. The measurement geometry and the count rate for determining the effect of dead time are the same as the actual logging conditions in the field; 2. The calibration uses both high-grade and low-grade models, not just Use a model