A tube-excited X-ray fluorescence spectrometer for use in small-diameter boreholes
نویسندگان
چکیده
منابع مشابه
X-ray Absorption Spectroscopy Using X–ray Fluorescence Spectrometer
Strong characteristic Kα X-ray lines are accompanied by weak lines due to the radiative Auger effect (RAE) [1, 2]. The characteristic Kα fluorescent X-rays (K-L2,3 lines) are emitted by the 2p→1s electric dipole transition after one of the 1s electron photoionization, Though the probability is less than 0.01, one of the 2p electrons is excited into an unoccupied discrete or continuum level simu...
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Thomas Bristow, Robert Downs, Marc Gailhanou, Franck Marchis, Douglas Ming, Richard Morris, Vicente Armando Solé, Kathleen Thompson, Philippe Walter, Michael Wilson, Albert Yen and Samuel Webb, NASA Ames Research Center, Moffett Field, CA [email protected], SETI Institute, Mountain View, CA, Univ. of Arizona, Tucson AZ, IM2NP, Université Paul Cézanne, Marseille, France, NASA Johnson Space Ce...
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This system consists of an air cooled low power x-ray tube (50W) with molybdenum anode and a thin (70μm) exit window. An optional beam filter can be inserted to reduce spectral background. The beam is focused onto the sample using a polycapillary x-ray optics, offering a focal spot of about 30μm FWHM. Characteristic X-rays from the sample are detected by means of a Si(Li) detector with ultra th...
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A newly developed, portable total reflection X-ray fluorescence (TXRF) spectrometer was tested during a field campaign on Chilean lakes and a German river in January 2002. The field measurements were compared with laboratory measurements carried out on a stationary instrument in the German laboratory. For method validation certified reference material (NIST SRM 1640 Trace elements in natural wa...
متن کاملImproved micro x-ray fluorescence spectrometer for light element analysis.
Since most available micro x-ray fluorescence (micro-XRF) spectrometers operate in air, which does not allow the analysis of low-Z elements (Z or = 6). It offers improved excitation and detection conditions necessary for light element analysis. To eliminate absorption of the ...
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ژورنال
عنوان ژورنال: Journal of Radioanalytical and Nuclear Chemistry Articles
سال: 1995
ISSN: 0236-5731,1588-2780
DOI: 10.1007/bf02041921