溴化镧和碘化钠探测器自然伽马测量差异实验研究OA

Nuclear logging is a core technology for oil and gas exploration,and natural gamma-ray spectrum measurement has strict requirements on detector indicators such as energy resolution and detection efficiency.This study was conducted to clarify the performance difference between LaBr3(Ce)and NaI(Tl)detectors in natural gamma measurement,and to provide experimental basis for the selection and application of nuclear logging detectors.Firstly,the performance parameters of two detectors were compared.Then through experiments,the performance difference between two crystal detectors in energy linearity,resolution,detection efficiency,and also their response differences during natural gamma-ray spectrum measurements were compared.The experimental results show that the difference of LaBr3 and NaI in energy linearity under normal temperature conditions is not significant.However,the former has a detection efficiency approximately 1.58 times that of the latter,and its energy resolution is much higher.However,LaBr3 detector is susceptible to the influence of internal background gamma rays,especially affecting the measurement of high-energy peaks for Th isotopes,which is unfavorable for the analysis of natural gamma-ray spectra.Through comparative analysis,it is concluded that NaI(Tl)detector has no background interference,mature preparation process and perfect application technology,and is still the mainstream choice in current nuclear logging field,while the large-scale engineering application of LaBr3(Ce)detector needs further technical research and optimization.