次生伽马能谱分析方法的实验研究

Experimental Study on the Spectral Analysis of Induced Gamma-Ray

贾建国，吴治华等．次生伽马能谱分析方法的实验研究．测井技术，１９９５，１９（４）：２９４～２９９本文指出一种地球化学闭合模型的热中子瞬发活化伽马分析方法，它是地球化学测井的核心技术，而标准谱的获得、基于标准借的加权最小二乘解谱方法、灵敏度刻度及地球化学闭合模型是这一方法的关键环节。我们在模拟井场条件下，对这一方法进行了实验研究。用ＮａＩ（Ｔ１）探测器获得了Ｆｅ，Ｓｉ，Ｃｌ，Ｈ等元素的标准借，并进行解谱拟合和灵敏度刻度，同时，用高纯锗探测器进行了分析对照。

The spectral analysis of thermal neutron captured prompt gamma ray combining with geochemical closure model is the key technique in geochemical logging.The acquirement of standard spectra,the weighted-least-square analysis based on the element standard spectra,the element sensitivity calibration and the geochemi caf closure model are the key steps in this method.By simulating the well conditions,an experimental study has been made on this method.With a NaI(T1) detector,the element standard spectra for Fe t Si,Cl,H,etc.have been obtained.The spectral analysis and the sensitivity calibration have also been done.High-pure ger manium detector is also used for the comparison of the analysis results.