A combination of NAA and micro-PIXE was used to study concentrations and distributions of platinum group elements (PGE) in ores from Xinjie Cu-Pt deposit.The NAA results of the bulk indicate that the ores belong to th...A combination of NAA and micro-PIXE was used to study concentrations and distributions of platinum group elements (PGE) in ores from Xinjie Cu-Pt deposit.The NAA results of the bulk indicate that the ores belong to the enriched Pt-Pd type.The element concentration maps of scanning micro-PIXE for the ores show that the occurence form of Pt is independent arsenide minerals. No PGE were detected in chalcopyrite of Xinjie Cu-Pt deposit. These information are economically beneficial to the mineral smelting process.展开更多
In order to develop new reference materials for microanalytical nuclear techniques, scanning proton microprobe (SPM) technique was used to determine homogeneity level within 100×200 μm 2 micro area on the small ...In order to develop new reference materials for microanalytical nuclear techniques, scanning proton microprobe (SPM) technique was used to determine homogeneity level within 100×200 μm 2 micro area on the small pieces of IAEA urban dust reference materials. The experimental methods were described in detail. The results show that IAEA 396A/M Vienna urban dust is homogeneous enough for small sample analysis of standard reference material (SRM).展开更多
In the ores of low-grade platinum deposits, the platinum concentration is very low(average Pt content 【1 μg. g<sup>-1</sup>), and the platinum minerals often occur as micron grains,thus making it difficu...In the ores of low-grade platinum deposits, the platinum concentration is very low(average Pt content 【1 μg. g<sup>-1</sup>), and the platinum minerals often occur as micron grains,thus making it difficult to study the platinum distribution oniy by routine tools, such aselectron microprobes or optic microscopes. As a result, the research and exploitation ofthese deposits in our country is hampered by the lack of more powerful tools.展开更多
Studies on distribution of trace gold mostly focus on some samples in whichgold content is well above 100 ppm at the present time due to the limitation of analy-sis methods. Progress in research on trace gold (usually...Studies on distribution of trace gold mostly focus on some samples in whichgold content is well above 100 ppm at the present time due to the limitation of analy-sis methods. Progress in research on trace gold (usually less than 100 ppm to n ppm)was rarely reported. Although electronic microprobe (EMP) and scanning electronicmicroprobe (SEM) have a high resolution, their detection limits are still 100-500ppm and 100-300 ppm, respectively. And also the electronic paramagnetic reso-nance spectrometer, an effective method for determining lattice gold of a few tenppm level, unfortunately is still incapable of doing such research. Newly展开更多
At present, the conventional elemental mapping method for routine scanning protonmicroprobe analyses is the TCEW method. With this method, the elemental mapsare obtained by making use of the total counts entering a si...At present, the conventional elemental mapping method for routine scanning protonmicroprobe analyses is the TCEW method. With this method, the elemental mapsare obtained by making use of the total counts entering a simple energy window onan X-ray peak. The fatal disadvantage of this method is that the total counts entering anenergy window contain the contribution of continuum background. Even when the elementof interest is abeent, the variation in the intensity of the background within the energy展开更多
文摘A combination of NAA and micro-PIXE was used to study concentrations and distributions of platinum group elements (PGE) in ores from Xinjie Cu-Pt deposit.The NAA results of the bulk indicate that the ores belong to the enriched Pt-Pd type.The element concentration maps of scanning micro-PIXE for the ores show that the occurence form of Pt is independent arsenide minerals. No PGE were detected in chalcopyrite of Xinjie Cu-Pt deposit. These information are economically beneficial to the mineral smelting process.
文摘In order to develop new reference materials for microanalytical nuclear techniques, scanning proton microprobe (SPM) technique was used to determine homogeneity level within 100×200 μm 2 micro area on the small pieces of IAEA urban dust reference materials. The experimental methods were described in detail. The results show that IAEA 396A/M Vienna urban dust is homogeneous enough for small sample analysis of standard reference material (SRM).
基金Project supported by the National Natural Science Foundation of Chinathe Mountain-Climbing Project of the State Commission of Science and Technology
文摘In the ores of low-grade platinum deposits, the platinum concentration is very low(average Pt content 【1 μg. g<sup>-1</sup>), and the platinum minerals often occur as micron grains,thus making it difficult to study the platinum distribution oniy by routine tools, such aselectron microprobes or optic microscopes. As a result, the research and exploitation ofthese deposits in our country is hampered by the lack of more powerful tools.
文摘Studies on distribution of trace gold mostly focus on some samples in whichgold content is well above 100 ppm at the present time due to the limitation of analy-sis methods. Progress in research on trace gold (usually less than 100 ppm to n ppm)was rarely reported. Although electronic microprobe (EMP) and scanning electronicmicroprobe (SEM) have a high resolution, their detection limits are still 100-500ppm and 100-300 ppm, respectively. And also the electronic paramagnetic reso-nance spectrometer, an effective method for determining lattice gold of a few tenppm level, unfortunately is still incapable of doing such research. Newly
基金Project supported by the National Natural Science Foundation of China.
文摘At present, the conventional elemental mapping method for routine scanning protonmicroprobe analyses is the TCEW method. With this method, the elemental mapsare obtained by making use of the total counts entering a simple energy window onan X-ray peak. The fatal disadvantage of this method is that the total counts entering anenergy window contain the contribution of continuum background. Even when the elementof interest is abeent, the variation in the intensity of the background within the energy
