Results 161 to 170 of about 996 (203)

Micro-PIXE study of gold archaeological objects

Journal of Radioanalytical and Nuclear Chemistry, 2003
Several fragments of ancient gold objects coming from an Eneolithic hoard and from Pietroasa ‘Closca cu Puii de Aur’ (‘The Golden Brood Hen with Its Chickens’) hoard, unearthed on Romanian territory, and two Romanian native gold nuggets samples were analyzed using micro-PIXE technique. The purpose of the study was to clarify the metal provenance. Trace
Bugoi, R., Cojocaru, V., Constantinescu, B., Constantin, D., Grambole, D., Herrmann, F.   +5 more
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MICRO-PIXE RECONNAISSANCE OF ALLANITE AS A PRASEODYMIUM SOURCE

International Journal of PIXE, 1996
Praseodymium is one of the most important pigment materials for high-quality china and ceramics but its source minerals are not well known to geologists. Allanite, one of the REE-bearing minerals in nature, has a large coordination polyhedra for cations and favors the larger LREE ions such as praseodymium than other REE-bearing minerals that favor the
SATOSHI MURAO, KAZUO NAKASHIMA, SOEY H SIE   +2 more
openaire   +1 more source

MICRO-PIXE APPLICATION TO THE SPHALERITE-GALENA GEOTHERMOMETER

International Journal of PIXE, 1997
We have applied the micro-PIXE technique to determining the cadmium content in sphalerite ( ZnS ) and galena ( PbS ) for use in geothermometry in the Bulawan gold-silver telluride deposit, Philippines. This geothermometry is based on the temperature control on the cadmium distribution between sphalerite and galena.
SATOSHI MURAO, VICTOR B. MAGLAMBAYAN, SOEY H. SIE   +2 more
openaire   +1 more source

Accuracy of thick-target micro-PIXE analysis

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1990
Abstract The accuracy attainable in micro-PIXE analysis is assessed in terms of the X-ray production model and its assumptions, physical realities of the specimen, the necessary data base, and techniques of standardization. NTIS reference materials are analyzed to provide the experimental tests of accuracy.
J.L. Campbell, W.J. Teesdale, J.-X. Wang
openaire   +1 more source

Application of micro-PIXE method to ore geology

AIP Conference Proceedings, 1999
Specific examples of ore mineral analysis by micro-PIXE are presented in this paper. For mineralogical usage it is essential to construct a specimen chamber which is designed exclusively for mineral analysis. In most of the analysis of natural minerals, selection of absorbers is essential in order to obtain optimum results.
S. Murao, S. H. Sie, S. Hamasaki, V. B. Maglambayan, X. Hu   +4 more
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Quantitative micro-PIXE analysis of Yanzhuang meteorite

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1995
Abstract Yanzhuang H6 chondrite is the most heavily shocked, severely reheated, partly melted and recrystallized meteorite formed in the environment of microgravity, high vacuum and ultralow temperature of the space. It is consequently the most valuable specimen for microgravity research on the mechanism of crystallization of FeNi alloy in space ...
Xiankang Wu, Jieqing Zhu, Zhaohui Li
openaire   +1 more source

Strontium depth distribution in human bone measured by micro-PIXE

X-Ray Spectrometry, 2009
<p>Strontium is naturally present in human bone, where it may exert beneficial or detrimental health effects depending on its concentration. The way strontium influences bone health and the concentrations at which the beneficial/detrimental health effects of strontium become important are still unknown, due partly to the difficulty of assessing ...
David R. Chettle, Ana Pejović-Milić, R. Butler, G. de Silveira, J. L. Campbell, Mariangela Zamburlini   +5 more
openaire   +1 more source

Micro-PIXE analysis of major elements in mineral specimens

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1993
Abstract Trace element analysis of mineral grains by micro-PIXE demands prior knowledge of major element concentrations from which the appropriate matrix corrections are derived. We describe the micro-PIXE determination of major elements using 750 keV protons.
J.L. Campbell, W.J. Teesdale
openaire   +1 more source

Macro- and micro-PIXE analyses of biological and medical samples

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1984
Abstract Since the development and optimalization of the PIXE technique, applications in biology and medicine have attracted many research workers. The reason for this can be found in the biomedical field and also in the analytical field. In biochemistry, the role of trace elements was underestimated previously but there is a growing awareness of the
R.D. Vis, C.C.A.H. Van der Stap, A.J.J. Bos   +2 more
openaire   +1 more source

Micro-PIXE Analysis of Trace Elements in Sulfides

AIP Conference Proceedings, 2003
Micro‐scale Proton‐induced X‐ray Emission (PIXE) of trace elements (TE) in sulfides provides insights into geologic processes including magmatic system evolution, ore forming events, and fluid‐flow processes. The Los Alamos nuclear microprobe was used to determine TE concentrations and ratios in sulfides from diverse geologic environments including ...
openaire   +1 more source