铀矿伽马能谱测井核脉冲信号数字化处理技术

在铀矿勘查中,可采用伽马能谱测井获取钻孔地层的铀、钍含量。相对于传统的模拟构架,基于数字化核脉冲信号处理技术构建的伽马能谱测井仪具有计数率高、信号噪声低和稳定性好等优点。通过采用核脉冲信号数字化处理技术,实现了伽马能谱的数字化采集,在放射性勘查模型井上进行了测试。混合模型的能谱测量铀、钍含量与标称含量的误差均小于5%,符合铀矿伽马能谱测井相关规范要求。

Digital processing techniques of nuclear pulse signal of gamma spectrometry logging

In uranium exploration,gamma ray spectrometry logging could be used to obtain the uranium and thorium contents in the drilled strata.Compared with the traditional analog architecture,the gamma ray spectrometer based on the digital nuclear pulse signal processing technology has the advantages of high counting rate,low signal noise and good stability.In this paper,the nuclear pulse signal digital processing technology was used to build the acquisition system of uranium gamma ray spectrometry logging,which had been tested in the radioactive exploration model well.The difference between the calculated uranium and thorium content and the nominal content of the mixed models both less than 5%,meeting the requirements of the relevant specification of uranium gamma ray spectrometry logging.