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intrinsic background radiation of LaBr3(Ce)detector via coincidence measurements and simulations

Nuclear Science and Techniques 2020年第10期31卷 33-42页

作者： Hao Cheng Bao-Hua Sun Li-Hua Zhu Tian-Xiao Li Guang-Shuai Li Cong-Bo Li Xiao-Guang Wu Yun Zheng School of Physics Beihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Big Data-Based Precision Medicine School of Medicine and EngineeringBeihang UniversityBeijing 100191China China Institute of Atomic Energy Beijing 102413China

The LaBr3(Ce)detector has attracted much attention in recent years because of its superior characteristics compared with other scintillating materials in terms of resolution and ***,it has a relatively high intrinsic background radiation because of the naturally occurring radioisotopes in lanthanum,actinium,and their daughter *** limits its applications in low-counting rate *** this study,we identified the radioactive isotopes in theφ3"x 3"Saint-Gobain B380 detector by a coincidence measurement using a Clover detector in a low-background shielding ***,we carried out a Geant4 simulation of the experimental spectra to evaluate the activities of the main internal radiation *** total activity of the background radiation of B380 is determined to be 1.523(34)Bq/cm^*** main sources include 138La at 1.428(34)Bq/cm^3,207Tl at 0.0135(13)Bq/cm^3,211Bi at 0.0136(15)Bq/cm^3,215Po at 0.0135(3)Bq/cm^3,219Rn at 0.0125(12)Bq/cm^3,223Fr at 0.0019(11)Bq/cm^3,223Ra at 0.0127(10)Bq/cm^3,227Th at 0.0158(22)Bq/cm^3,and 227Ac at 0.0135(13)Bq/cm^*** these,the activities of 207Tl,211Po,215Po,223Fr,and 227Ac are deduced for the first time from the secular equilibrium established in the decay chain of 227Ac.

关键词： LaBr3 Coincidence measurement technique intrinsic radiation GEANT4 simulation

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GV Technology for Exploration and Delineation of Lode Gold Claims

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Journal of Geological Resource and Engineering 2014年第1期2卷 1-12页

作者： Jim Combs Jeffrey Drizin Geo Vision Inc. 12945 Vanderbilt Drive #207 Naples 34110 FL USA Geo Vision Inc. 1910 Browning Court Highland Park 60035 IL USA

Demands for new gold deposits are increasing worldwide and the need to better define lode and placer claims is a critical environmental and economic issue. Recently, interesting results have been produced using dedicated geological information systems designed to explore for earth mineral deposits. These systems employ properties of fundamental physical fields generated by interactions of superlight elementary particles. GV technology （Geo-Vision geological direct detection radiometric and Air-Gamma technology）, a revolutionary technology for exploring the earth from outer space and from inside aircraft, has been utilized to identify and precisely locate gold deposits. All elements of the Earth＇s crust exist in an excited state and are constantly emitting what can be called their ＂intrinsic radiation＂. The melding of science and data interpretation makes GV Technology ideal for defining both lode and placer gold deposits. The use of GV technology will improve success ratios associated with the exploration for and delineation of gold deposits and provide better definition of successful core drilling locations. The technology will also decrease the cost of defining gold deposits and since GV technology is ecologically friendly, it provides considerable reductions in environmental mitigation costs. From 1995 to 2014, GV technology has been used to identify and delineate gold deposits in Russia, Mongolia, Kirghizia, Tanzania, Ethiopia, Namibia, Australia, and the United States.

关键词： GV technology intrinsic radiation super small subatomic particles satellite imagery gold exploration.

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