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Prompt fission neutron uranium logging(Ⅲ):logging instrument 认领 引用
1
作者 Hai‑Tao Wang Yan Zhang +9 位作者 Chi Liu Jian‑Qiang Xu Li‑Jiao Zhang Zhi‑Feng Liu Xiong‑Jie Zhang Rui Chen Qi Liu Ren‑Bo Wang Shu‑Min Zhou Bin Tang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第7期115-127,共13页
The domestically developed prompt fission neutron uranium logging(PFNUL)instrument for uranium exploration represents a significant advancement in China’s deep uranium mining efforts,although it has considerable chal... The domestically developed prompt fission neutron uranium logging(PFNUL)instrument for uranium exploration represents a significant advancement in China’s deep uranium mining efforts,although it has considerable challenges and complexity.This paper presents the development of a new prompt fission neutron uranium logging instrument(named UNL4)that integrates a domestic D-T neutron generator,two 3He proportional detectors,a lanthanum bromide(LaBr3)gamma-ray detector,and a digital multi-channel pulse amplitude analyzer.The near 3He detector is shielded with 1 mm of cadmium(Cd)and 5 mm of high-density polyethylene(HDPE),enabling efficient epithermal neutron detection,whereas the far 3He detector measures thermal neutrons.A LaBr3 detector is employed for gamma-ray detection,primarily originating from uranium decay.Highspeed analog-to-digital converter(ADC)and field-programmable gate array(FPGA)technologies are used to achieve rapid acquisition and transmission of both dual-energy neutron time spectra and gamma spectra.Moreover,this paper proposes a fast signal-shaping method,which reduces the dead time effect in 3He detectors on neutron time spectra.Experiments conducted in standard model boreholes with varying uranium contents demonstrated a strong linear relationship between the epithermal-to-thermal neutron ratio(E/T)and uranium content,with a fitting coefficient of R2>0.999,confirming the accuracy of the instrument.The E/T value repeatability,in both short-term(3.16%RSD)and long-term(1.2%RSD)measurements,showed excellent stability.In addition,the instrument demonstrated good performance at neutron-logging speeds of 0.3∼3 m∕min(E/T values)and gamma logging speeds of 1∼10 m∕min.Through measurements in two ore sections of the PU model with uranium contents of 87.1 ppm and 45.6 ppm showed that RD remained below approximately 10%at logging speeds of 0–2 m/s in both cases,satisfying the requirements for engineering applications.This marks the first successful development of a neutron-logging instrument for uranium exploration based on a domestic neutron generator and signifies an important contribution to uranium resource exploration. 展开更多
关键词 Uranium exploration Neutron-logging instrument Pulsed neutron Neutron time spectrum detection
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Prompt fission neutron uranium logging(Ⅰ):direct uranium quantification method theory 认领 引用 被引量：1
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作者 Yan Zhang Chi Liu +6 位作者 Hai-Tao Wang Xiong-Jie Zhang Zhi-Feng Liu Rui Chen Jin-Hui Qu Ren-Bo Wang Bin Tang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2025年第6期216-227,共12页
Prompt fission neutron uranium logging(PFNUL)is an advanced method for utilizing pulsed neutron bombardment of the ore layer and a fission reaction with uranium(235U)to detect the transient neutrons produced by fis... Prompt fission neutron uranium logging(PFNUL)is an advanced method for utilizing pulsed neutron bombardment of the ore layer and a fission reaction with uranium(235U)to detect the transient neutrons produced by fission and then directly measure and quantify uranium;however,the stability and lifetime performance of pulsed neutron sources are the key constraints to its rapid promotion.To address these problems,this study proposes a PFNUL technique for acquiring the time spectrum of dual-energy neutrons(epithermal and thermal neutrons)from the upper and lower detection structures and establishes a novel uranium quantification algorithm based on the ratio of epithermal and thermal neutron time windows(E/T)via a mathematical-physical modeling derivation.Through simulations on well-logging models with di erent uranium contents,the starting and stopping times of the time window(Δt)for uranium quantification in the dual-energy neutron time spectrum are determined to be 200 and 800μs,respectively.The minimum radius and height of the model wells are 60 and 120 cm,respectively,and the E/T values in the time window show an excellent linear relationship with the uranium content.The scale factor is KE/T=1.92 and R2=0.999,which verifies the validity of the E/T uranium quantification algorithm.In addition,experiments were carried out in the Nu series of uranium standard model wells,and the results showed that under di erent neutron source yields,the E/T-based uranium quantification method reduced the relative standard deviation of the scale factor of the uranium content from 33.41%to 1.09%,compared with a single epithermal neutron quantification method.These results prove that the E/T value uranium quantification method is una ected by the change in the neutron source yield,e ectively improves the accuracy and service life of the logging instrument,and has great scientific and popularization value. 展开更多
关键词 PFNUL Uranium exploration Pulsed neutrons Neutron time spectrum
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China's Technologies for Exploration and Mining of Uranium Deposits Have Stepped into the World's Top Team 认领 引用 被引量：1
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作者 HAO Ziguo FEI Hongcai +1 位作者 LIU Lian Susan TURNER 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2013年第6期1744-1744,共1页
On June 2011, the Beijing Research Institute of Uranium Geology, an Institute within the China National Nuclear Corporation （CNNC）, and the Department of Geology ＆ Mining CNNC carried out a project Scientific Drill... On June 2011, the Beijing Research Institute of Uranium Geology, an Institute within the China National Nuclear Corporation （CNNC）, and the Department of Geology ＆ Mining CNNC carried out a project Scientific Drilling.for Deep Metallogenic Research in the Xiangshan Large Uranium Ore Field. A year later on June 21, the project, representing the first scientific drilling of China＇s uranium, was officially launched, and successfully completed on June 17, 2013. A 2818.88 m of drilling depth has broken the previous record 1200 m of exploration depth. 展开更多
关键词 China’s Technologies for Exploration and Mining of Uranium Deposits Have Stepped into the World’s Top Team
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Investigation for Uranium Dispersion Adjacent to Cretaceous Phosphatic Outcrops in Al-Nassrieh Basin, Southern Palmyrides, Syria 认领 引用
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作者 Mohamed Al-Hilal Ahmad Al-Ali 《Journal of Earth Science》 SCIE EI CAS CSCD 2016年第5期786-795,共10页
A detailed radiometric survey including soil gas radon measurements and field gammaray survey, in accordance with geochemical and geological investigations were carried out in AlNassrieh Basin（central Syria）, for th... A detailed radiometric survey including soil gas radon measurements and field gammaray survey, in accordance with geochemical and geological investigations were carried out in AlNassrieh Basin（central Syria）, for the purpose of uranium exploration. Thirty-six samples were collected from various lithofacies of the survey area and analyzed by γ-ray spectrometric technique for determining the concentration values of major radioelements. The relationships between the concentrations of equivalent e U, e Th, and their ratios were examined in order to define their trend of variations and evaluate the degree of uranium remobilization and redistribution. Although the initial results indicate that uranium enrichment is mostly restricted to the Upper Cretaceous phosphate rocks, a considerable portion of uranium appeared to be leached out of the primary phosphatic source and dispersed in the adjacent recent sediments. Further, notable increases of radon level associated with relatively high values of uranium concentration and gamma count rates were found to be spatially correlated with the transition zone between the marine Paleogene and continental Neogene formations throughout the study basin. This observation demonstrates the importance of the concerned zone as a suitable geological environment for hosting probable uranium mineralization along a chemically reducing interface where surface water of terrestrial and marine origin mingled at depth and away from surficial conditions. 展开更多
关键词 radiometric survey geochemistry uranium exploration AI-Nassrieh Basin Syria.
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HUANG Shaoxian 认领 引用
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《Geoscience Frontiers》 SCIE CAS CSCD 2025年第3期I0006-I0006,共1页
Huang Shaoxian(1914-1989),born in Jimo County,Shandong Province in 1914.Huang Shaoxian graduated from the Department of Geology,Geography and Meteorology at the National Southwestern Associated University in 1940.He w... Huang Shaoxian(1914-1989),born in Jimo County,Shandong Province in 1914.Huang Shaoxian graduated from the Department of Geology,Geography and Meteorology at the National Southwestern Associated University in 1940.He was elected as an academician of the Chinese Academy of Science in 1980 and served as Deputy Director and Senior Engineer at the Third Research Institute of the Ministry of Nuclear Industry.He achieved the first domestic discovery of chromite deposits in China,filling a critical gap in the nation's mineral resources.Dedicated to uranium resource exploration and scientific research throughout his career,he led the working group to achieve breakthroughs in exploration technologies for granite-type and carbon-siliceous-pelitic rock-type uranium deposits.As a pioneer and foundational figure in China's uranium geology,he made significant contributions to the development of the country's nuclear industry and uranium geology. 展开更多
关键词 uranium resource exploration granite type uranium deposits nuclear industry carbon siliceous pelitic rock type uranium deposits chromite deposits uranium geology
Markers and Genetic Mechanisms of Primary and Epigenetic Oxidation of an Aeolian Depositional System of the Luohandong Formation,Ordos Basin 认领 引用 被引量：6
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作者 Yao Xiang Yangquan Jiao +2 位作者 Liqun Wu Hui Rong Fan Zhang 《Journal of Earth Science》 SCIE CAS CSCD 2022年第2期358-372,共15页
Uranium exploration breakthrough was extremely rare in an aeolian depositional system.In order to know the complicate characteristics of oxidation associated closely with uranium mineralization in the aeolian depositi... Uranium exploration breakthrough was extremely rare in an aeolian depositional system.In order to know the complicate characteristics of oxidation associated closely with uranium mineralization in the aeolian depositional system,petrology and mineralogy markers of the oxidation and its genetic mechanisms are identified and illustrated by fieldwork,thin section analysis and scanning electron microscopy test,based on 2 field outcrops in Zhenyuan County in the southwest of the Tianhuan depression in the Ordos Basin and the core of 2 wells in the north and south of Ordos Basin.The results showed:the typical macroscopic indicator of primary oxidation was the red fine sediments in the aeolian interdune with a thickness of 10-50 cm,and the microscopic characteristics of primary oxidation were the minerals such as hematite,ilmenite,and the irony matrix rich in fine-grained dolomite and biotite;the phreatic oxidation was manifested as the red sandstone with limonite horizontal layer with a thickness of 1-4 cm and a width of 60 cm-1 m,and the circular limonite nodules with a diameter of 3-7 cm,in which there was intergranular limonite cement;the interlayer oxidation was characterized by lenticular tongue and tapered red sandstone with a length of 1-10 m and a width of 10 cm-5m,in which detrital particles are coated with hematite and hematite was distributed inside the rhombus dolomite.The paleoclimate of the sedimentary period,the water-table movement and the pore and permeability conditions of the sand body were the key factors for the formation of different oxidation types in the aeolian depositional system. 展开更多
关键词 Ordos Basin aeolian depositional system primary oxidation epigenetic oxidation sandstone-type uranium exploration ore deoposit geology
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