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Zircon U-Pb-Hf and trace element signatures reveal the petrogenesis of the Jiuyishan granitic complex， South China: Implications for W-Sn and rare metal mineralization

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Journal of Earth Science 2024年

作者： Wenzhou Xiao Chaoyun Liu Kaixuan Tan Xianzhe Duan Qinglin Sui Kaituo Shi Peng Feng Mabrouk Sami Quan Ou Hunan Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes， School of Resource Environment and Safety Engineering， University of South China Fundamental Science on Radioactive Geology and Exploration Technology Laboratory， East China University of Technology Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring， Ministry of Education， School of Geosciences and Info-Physics， Central South University Geology Department， Faculty of Science， Minia University State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Institute of Sedimentary Geology， Chengdu University of Technology

The Jiuyishan granitic complex， located in the Nanling Range， South China， is composed of five granitic plutons （Xuehuading， Jinjiling， Pangxiemu， Shaziling and Xishan）. Zircon U-Pb dating of four plutons （Jinjiling， Pangxiemu， Shaziling and Xishan） yielded similar ages of approximately 153 Ma， indicating indistinguishable ages within error. Three plutons except the Shaziling pluton， have consistent εNd（t）（-7.8 to -5.8） and εHf（t）（-9.1 to -2.2） values， which are similar to those of the lower crustal granulitic metasedimentary and meta-igneous rocks in South China. Comparing to other three plutons， the Shaziling pluton has consistent εHf（t）（-7.4 to -6.8） and εHf（t）（-7.5 to -4.7） values and shows similar source， but the Shaziling mafic microgranular enclaves （MMEs） show variable εHf（t）（-14.2 to 4.8） values， indicating a remarkable mantle magma injection of the Shaziling pluton. Zircon Ce/Sm-Yb/Gd， whole-rock CaO-P2O5and CaO-TiO2linear trends revealed that from the Xishan to the Shaziling and from the Jinjiling to the Pangxiemu granites， they experienced apatite and titanite fractionation， respectively. Zircon Th， U， Nb， Ta， Hf， Ti， Y， P and rare earth element （REE） contents and whole-rock Sr， Ba and Rb contents also show that the Shazling， Xishan， Jinjiling and Pangxiemu granites followed a discontinuous evolutionary series， but the Pangxiemu granites exhibit highly evolved nature. Four main controlling factors of W-Sn and rare metal mineralization in granitic rocks were discussed， and we found that the mineralization in Jiuyishan granitic complex was mainly controlled by the fractionation degree and crystallization temperature， but were rarely affected by oxygen fugacity and mantle material input. The Pangxiemu granites show particularly higher Rb and Ta contents than the other three plutons， implying that the ore deposits developed in the Jiuyishan complex were directly related to the most evolved Pangxiemu pluton， with the occurrence of Rb and Ta as the most l

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A study on a nonlinear least-squares fitting method for 3D positioning of gamma rays based onmonolithic crystal and SiPM array

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Radiation Detection technology and Methods 2022年第3期6卷 375-390页

作者： Hongfan Zhang Rong Zhou Rutao Yao Chaowen Yang Su Xu Yijia Shu Bing Jiang Lang Liu Sichuan Management and Monitoring Center Station of Radioactive Environment Chengdu 611139Sichuan provinceChina Key Laboratory of Radiation Physics and Technology College of PhysicsMinistry of EducationSichuan UniversityChengdu 610064Sichuan provinceChina Department of Nuclear Medicine Department of BiophysicsDepartment of Pharmacy PracticeSchool of Medicine and Biomedical SciencesUniversity at BuffaloSUNYBuffaloNY 14214USA Key Laboratory of Radiation Physics and Technology Department of Nuclear Engineering and TechnologyCollege of Physical Science and TechnologyMinistry of EducationSichuan UniversityChengdu 610064Sichuan provinceChina

Purpose In order to improve imaging quality of position sensitive gamma detectors,many research groups especially those interested in positron emission tomography(PET)imaging have done many efforts to develop detecting method with depth of interaction(DOI)capability.A detector with a monolithic lutetium yttrium silicate(LYSO)crystal and an silicon photomultiplier(SiPM)array is constructed by our group for DOI detecting *** 3D interaction coordinates of gamma rays are estimated by a nonlinear least-squares fitting method based on an analytical model in which photon number collected by an SiPM pixel is related to solid angle seen from gamma interaction point and boundary *** have assessed the gamma positioning performance of our detector by projecting a line-like 137Cs gamma beam on top and side surface of the *** source and solid angle factors in the analytical model have also been tested for the best performance both in simulations and *** Good gamma positioning images are demonstrated with both X–Y and DOI positioning resolutions close to 2 mm full width at half maximum(FWHM).Conclusion Comparing to former DOI methods,the performance of our DOI detector can be called competitive in positioning resolution,construction cost and difficulty of assembling.

关键词： PET DOI Monolithic crystal SiPM

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Geochronology and zircon geochemistry of auriferous intrusions in the Bumo deposit,Hainan Province,China

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Acta Geochimica 2022年第2期41卷 208-225页

作者： Yan Hai Bingtao Li Teng Deng Deru Xu Li Wang Youzhong Xiong Xiaowen Zhang Zhiling Wang Shaohao Zou Zhengpeng Ding Qian Qian Shichao Guo School of Earth Sciences East China University of TechnologyNanchang 330013China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China Zhaojin Group Co. LtdDongfang 572600HainanChina Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology East China University of TechnologyNanchang 330013JiangxiChina Resource and Environment Survey Institute of Hainan Province Haikou 570206China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China

Intrusion-related gold deposits(IRGS)are a lowgrade,large-tonnage exploration ***,auriferous magmatic rocks were found in the Bumo deposit of the Gezhen shear zone in Hainan Province,***,the geochronology and geochemical characteristics of the intrusions,as well as the mineralization potential,are still *** and petrographic work show that the sulfidebearing intrusions can be divided into diorite porphyrites,quartz monzodiorites and *** LA–ICP–MS U–Pb dating demonstrates that diorite porphyrites,quartz monzodiorites and monzodiorites were formed at104±1,114±1,114±1 Ma,*** addition,sulfides in Yanshanian intrusion-related gold mineralization haveδ;S values of 0.2–4.4%,lower than those in Hercynian-Indosinian(1.9–9.8%)orogenic deposits(ca.219–378 Ma)in the Gezhen shear *** addition,all these intrusions display close correlations between Eu/EuN*with Th/U,consistent with the differentiation of amphibole,apatite and titanite from a hydrous ***,zircon Eu/EuN*in the intrusions are higher than0.4,demonstrating that the magmatic rocks have high water contents and oxygen fugacity values,favorable for gold ***,the Yanshanian magmatic rocks can be a new potential gold exploration target in the Gezhen shear zone.

关键词： Hainan Bumo Intrusion-related mineralization Zircon trace elements Gold mineralization

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Feasibility of producing ²²⁵Ac via thermal neutron irradiation of ²²⁶Ra: A systematic theoretical study

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Nuclear Analysis 2024年第3期3卷

作者： Qiu, Long Zhang, Jinsong Lan, Tu Liao, Jiali Yang, Yuanyou Li, Feize Liu, Ning Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and Technology Sichuan University Sichuan Engineering Research Center for Radioactive Isotope National Engineering Research Center for Isotopes and Pharmaceuticals Nuclear Power Institute of China

With a suitable half-life and abundant radiolabeling strategy, 225Ac has become one of the most promising radionuclides in the area of targeted alpha therapy. However, limited radionuclide supply is threatening the de... 详细信息

With a suitable half-life and abundant radiolabeling strategy, ²²⁵Ac has become one of the most promising radionuclides in the area of targeted alpha therapy. However, limited radionuclide supply is threatening the development of ²²⁵Ac related endoradiotherapy dramatically. As the parent nuclide of ²²⁵Ac, ²²⁹Th can be produced via ²²⁶Ra(3n, 2β)²²⁹Th reaction in a nuclear reactor. However, related practice has not been conducted in large scale, since the nuclear reaction pathway for producing ²²⁹Th is complicated. In this work, the feasibility of producing ²²⁵Ac/²²⁹Th in a reactor was confirmed by systematic theoretical calculations, and a procedure that combines irradiation with separation process was proposed. The results show that 176 MBq of ²²⁹Th can be produced by irradiating 1.0 g of ²²⁶Ra with a neutron flux density of 1 × 10¹⁵ n cm⁻² s⁻¹ for 90 days. This will generate 150 MBq of ²²⁵Ac monthly from a radionuclide generator, which is sufficient for the single treatment cycle of 200 patients each year considering the radioactivity loss in radiochemical separation, transfer and radiolabeling process. In addition, this irradiation process will also produce 37.8 GBq ²²⁷Ac for the preparation of ²²⁷Ac-²²⁷Th-²²³Ra generator. In general, the production of ²²⁵Ac by neutron irradiation of ²²⁶Ra in reactor is practicable and holds potential to alleviate the shortage of current supply of ²²⁵Ac. © 2024 The Authors

关键词： 225Ac Alpha-emitting radionuclide Neutron reactions Reactor Theoretical calculation

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Numerical Analysis of Dispersion Compensation Schemes for Pseudo-linear Transmission System

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Journal of Optical Communications 2016年第1期37卷 81-85页

作者： Chen, Xu Zhao, Yajing Zhang, Lu Cai, Ju Zhou, Wei Liu, Lichuan Department of Electrical Engineering Northern Illinois University DeKalbIL60115 United States Institute of Nuclear Science and Technology Sichuan University Chengdu610064 China Key Laboratory of Radioactive Physics and Technology Ministry of Education of P.R.China Chengdu610064 China College of Communication Engineering Chengdu University of Information Technology Chengdu610225 China Education Department Key Laboratory of Radioactive Physics and Technology Sichuan University Chengdu610064 China

A pseudo-linear optical transmission system analytical model is built for the numerical analysis of dispersion compensation schemes. The system performance under the influence of intra-channel nonlinear effects and the initial pulse power is discussed for the data rates of 10, 40, 100 and 160 Gbit/s, respectively. We get the conclusion for the first time as we know the optimal dispersion compensation scheme for the optimal system performance is closely related to the system data rate and the proportion of the pre-dispersion compensation should be decreased while that of the post-dispersion compensation be increased with the increasing of system data rate. When the system data rate is higher than 160 Gbit/s, we can use the post-dispersion compensation scheme directly. © 2016 by De Gruyter.

关键词： Light transmission

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Recent advances in the treatment of irradiated graphite: A review

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Annals of Nuclear Energy 2017年 110卷 140-147页

作者： Junfeng Li Mary Lou Dunzik-Gouga Jianlong Wang Collaborative Innovation Center for Advanced Nuclear Energy Technology Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 PR China Nuclear Engineering and Health Physics Idaho State University 996 University Boulevard Idaho Falls ID 83401 United States Beijing Key Laboratory of Radioactive Waste Treatment INET Tsinghua University Beijing 100084 PR China

Graphite is used as a moderator and reflector in nuclear reactors. Fission products and activation of impurities in the graphite contaminated this graphite during reactor operation. Larger amount of irradiated graphite has to be considered as radioactive waste. The management of irradiated graphite waste is becoming an increasingly important issue worldwide. The objective of this paper was to briefly review the recent advances in the treatment and disposal of irradiated graphite to offer deep insight into a better understanding of the techniques for the management of irradiated graphite from nuclear reactors. The properties of irradiated graphite were briefly introduced. The formation of radionuclides, especially C-14, Cl-36 and H-3, in the irradiated graphite was summarized. The main features of Wigner treatment, thermal treatment, chemical treatment, conditioning, coating and impregnation, gasification were addressed. The final end point of the graphite and the final end point of the radionuclides were discussed and their influences on selection of treatment methods were compared.

关键词： Irradiated graphite Characterization Treatment Cementation Incineration

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Electron Irradiation Effects of SrZrO 3 Ceramic for radioactive Strontium Immobilization

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Procedia Environmental Sciences 2016年 31卷 330-334页

作者： Yushan Yang Xianzhou Ning Shunzhou Luo Faqin Dong Lifan Li Key Subject Laboratory of Defense for Radioactive Waste and Environmental Security Southwest University Science and Technology Mianyang 621010 China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China

The perovskite structure is widely considered ideal host phases for Sr immobilization. To investigate the radiation tolerance on ceramic waste forms, the as-prepared SrZrO 3 ceramics were irradiated by external electron beam. The results indicated that the electron irradiation had different influence on the surface and inside of the SrZrO 3 ceramic. The no-crystallizing can be produced on the surface of SrZrO 3 ceramic, and electron beam heating promoted grain growth in the inside of SrZrO 3 .

关键词： Ceramics mmobilization Electron irradiation Microstructure

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First Principles Study of Uranium Solubility in Gd2Zr2O7 Pyrochlore

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Chinese Journal of Chemical physics 2015年第6期28卷 -页

作者： Qing-yun Chen Kai-min Shih Chuan-min Meng Lie-lin Wang Hua Xie Tao Wu Key Subject Laboratory of National Defense for Radioactive Waste and Environmental Security Southwest University of Science and Technology Mianyang 621010 China Department of Civil Engineering The University of Hong Kong Pokfulam Road Hong Kong SARChina Key Lab for Shock Wave and Detonation Physics Research Institute of Fluid Physics Chinese Academy of Engineering Physics Mianyang 621900

Ab initio calculation is performed to investigate the uraniumsolubility in different sites of Gd2Zr2O7 pyrochlore. The Gd2Zr2O7 maintains its pyrochlore structure at low uraniumdopant levels, and the lattice constants of Gd2(Zr2?yUy)O7 and (Gd2?yUy)Zr2O7 are generally expressed as being linearly related to the uranium content y. Uranium is found to be a preferable substitute for the B-site gadolinium atoms in cation-disordered Gd2Zr2O7 (where gadolinium and zirconium atoms are swapped) over the A-site gadolinium atoms in ordered Gd2Zr2O7 due to the lower total energy of (Gd2?yZry)(Zr2?yUy)O7.

关键词： Gd2Zr2O7 pyrochlore Nuclear waste Uranium solubility Density functional theory

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Leaching Stability of Simulated Waste Forms for Immobilizing An^(3+) by Gd_2Zr_2O_7 with Nd^(3+)

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Journal of Wuhan University of technology(Materials Science) 2014年第5期29卷 885-890页

作者：卢喜瑞 CHEN Mengjun DONG Faqin WANG Xiaoli WU Yanlin XIAO Zhengxue Key Subject Laboratory of National Defense for Radioactive Waste and Environmental Security Southwest University of Science and Technology Key Laboratory of Radiation Physics and Technology (Sichuan University) Ministry of EducationInstitute of Nuclear Science and Technology Sichuan University Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics School of High Energy Accelerator Science Graduate University for Advanced Studies

In order to investigate the anti-leaching capability of pyrochlore Gd2Zr2O7 immobilized An3＋, trivalent neodymium was used as the simulacrums for radioactive wastes with trivalence, Gd2-xNdxZr2O7（0.0 ≤ x≤2.0） series samples were successfully synthesized by high temperature solid reaction and using Gd2O3, ZrO2 powders as starting materials. The experiments of long-term chemical stability were conducted in synthetic seawater at 40 and 70 ℃. The XRD diffractive data and extraction ratio of as-received samples were collected with the help of X-ray diffraction （XRD） instrument and inductively coupled plasma mass spectrometry （ICP- Mass）. The results indicate that the phases of as-received compounds keep the single phase of pyrochlore. The extraction ratio of Gd3＋, Zr4＋ and Nd3＋ in waste forms is increasing with the increase of immersion time in synthetic seawater. The extraction ratio of waste forms at 70 ℃ is higher than at 40 ℃. The highest extraction ratio of Gd3＋, Zr4＋ and Nd3＋ after 42 days is near 0.025 8, 0.003 8 and 0.045 2 μ***-1, respectively.

关键词： pyrochlore radioactive waste with trivalence waste forms anti-leaching capability

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Phase and Structure in the System Gd_(2-x)Eu_xZr_2O_7 (0.0≤x≤2.0)

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Journal of Wuhan University of technology(Materials Science) 2014年第1期29卷 1-4页

作者：卢喜瑞 DONG Faqin SONG Gongbao LIU Ning WANG Xiaoli WU Yanlin Key Subject Laboratory of National Defense for Radioactive Waste and Environmental Security Southwest University of Science and Technology Key Laboratory of Radiation Physics and Technology (Sichuan University) Ministry of Education Institute of Nuclear Science and Technology Sichuan University Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics School of High Energy Accelerator Science Graduate University for Advanced Studies

Pyrochlore Gd2Zr2O7 are considered as an excellent candidate for treatment of radioactive waste forms, because of its superior physical, chemical and anti-irradiation properties. To investigate the phase and structure of pyrochlore Gd2Zr2O7 used for immobilizing Pu （Ⅲ）, trivalent europium was used as the simulacrum for plutonium with trivalence. The compounds of stoichiometry Gd2-xEuxZr2O7（0.0≤x≤ 2.0） synthesized by high temperature solid state reaction method, were analyzed with the help of XRD and Rietveld structural refinement method. The results indicated that the phases of compounds continuously kept the phase of pyrochlore under our experimental condition. The linear relation between a and x was discovered in the system of Gd2-xEuxZr2O7（0.0≤x≤ 2.0） at 1 773 K, which accorded with a = 10.538 41 ＋ 0.008 95 x, V = 1 170.373 32 ＋ 2.985 97 x.

关键词： pyrochlore phase relation radioactive waste structural refinement

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