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1970年后由美国圣地亚国家实验室和美孚石油公司发展的瞬发裂变中子铀矿测井方法是一种直接的地层铀含量测量方法,这种方法克服了传统自然伽玛铀矿测井中存在的铀镭放射性平衡的问题。其基本原理是利用14 MeV脉冲中子连续照射地层,经地层慢化选出的热中子与地层~(235)U发生热中子核裂变反应,通过测量地层产生的超热裂变中子与热中子计数的比值来定量地层的铀含量,该原理称为超热中子一热中子
The instant fission neutron uranium logging method developed by the Sandica National Laboratories and Mobil Oil Company after 1970 is a direct method for measuring uranium content in formations. This method overcomes the challenges of conventional natural gamma-ray uranium logging In the presence of uranium radioactive radioactive balance issues. The basic principle is to use the 14 MeV pulsed neutron to continuously irradiate the formation. The thermal neutron selected by the formation slowing and the stratum ~ (235) U undergo thermal neutron fission reaction. By measuring the thermal fission neutrons and Thermal neutron count ratio to quantify the formation of uranium content, the principle known as superheat neutron a thermal neutron