铀裂变瞬发中子测井与铀定量分层解释的基础研究

项目名称： 铀裂变瞬发中子测井与铀定量分层解释的基础研究

项目编号： No.41330318

项目类型： 重点项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 汤彬

作者单位： 东华理工大学

项目金额： 300万元

中文摘要： 依据高能中子轰击井下物质，使其发生散射、俘获、活化、裂变并诱发次生射线，探测原生/次生的中子衰减时间谱，或瞬发/缓发的次生射线能谱，可研发矿产勘查的中子测井诸方法。相比间接测铀的自然γ测井(须岩芯化学分析修正铀定量)，被美欧核大国掌控的铀裂变瞬发中子测井可直接测铀(但限制仪器出口到我国)，属先进铀定量方法。该方法利用脉冲中子源发射原生中子，轰击钻孔物质与地层岩石，诱发235Ｕ裂变并放射瞬发中子，探测该瞬发中子可实现铀定量。为此，项目研究内容为：①研究原生中子与铀裂变瞬发中子慢化的低能中子衰减时间谱及变化规律；②研究从该中子衰减时间谱中提取铀裂变信息的方法及影响因素；③研究铀裂变的空间分布规律及铀定量快速算法；④研究层状铀矿的分层解释方法及影响因素修正技术。项目研究目标为：突破美欧技术封锁，创新深部铀矿床含矿信息的提取方法，促使铀裂变瞬发中子测井成为我国实用方法，以摒弃自然γ测井的铀定量。

中文关键词： 铀矿探采;深部矿床;脉冲中子测井;铀裂变瞬发中子;分层解释

英文摘要： According the principle of high-energy neutron bombarding the underground substances, making them scattering, capture, activating, fission and inducing secondary radioactive rays, detecting the decay time spectrum from native/secondary neutrons, or energy spectrum from prompt/delayed secondary radioactive ray, many of the new technology of neutron logging can be researched and developed for mineral exploration. Compare with the natural gamma logging measuring uranium content indirectly (required chemical analysis of core-samples), Uranium fission prompt neutron logging which controlled by U.S. and Europe nuclear powers, can measuring uranium content directly (however it being restricted exports to China), and it belong in a advanced method for uranium determination. This method uses a pulsed neutron source, emitting native neutrons bombarding the drilling-hole materials and formation-rock, inducing 235U fission and sending out prompt neutrons. By detecting those prompt neutrons the uranium determination can be realized. In this respect, the project content: .(1) To study the decay time spectrum and its variation of low-energy neutrons slowing down from native neutrons and uranium fission neutrons; .(2) To study the method and influencing factors of extracting uranium fission information from the decay time spectrum of neutron;.(3) To study the principle of spatial distribution of uranium fission neutrons and uranium determination rapid algorithm; .(4) To study the subdivision interpretation method for uranium determination, and the correction technology of influencing factors..The objectives of project research: to break through the US-European technology blockade; to innovate extracting method of uranium information in deep deposits; to promote uranium fission prompt neutron logging method become a practical method in China and abandoning the method of natural gamma logging for uranium quantitative.

英文关键词： Uranium Exploration and Mining;Deep Deposit;Pulsed Neutron Logging;Uranium Fission Prompt Neutron;Subdivision Interpretation