X-ray or gamma ray systems or devices – Specific application – Fluorescence
Patent
1998-09-17
2000-10-10
Bruce, David V.
X-ray or gamma ray systems or devices
Specific application
Fluorescence
378 44, 378 54, 378 55, G01N 23223
Patent
active
061309311
ABSTRACT:
An apparatus for measuring the composition of coal and mineral ores on-line, by bombarding a sample stream with low energy X-rays and measuring the characteristic X-rays fluoresced. The assembly is comprised of one or more X-ray generators mounted in a specific geometry with one or more silicon detectors. A representative sample of a flow stream is obtained from a sampling system. Sample presentation to the analyzer is done with a plow or a flow cell to obtain a uniform interrogation zone for the analyzer. Elemental analysis (Aluminum through Silver on the Periodic Table) of the sample is computed from calibration curves generated from a linear relationship with count rates under each peak. Sample presentation to the analyzer is done with a plow or leveling plate to ensure that material flows past the analyzer at a constant level. The elemental analysis is determined by measuring counts under the characteristic peaks fluoresced by various elements in an energy spectrum resolved with a multi-channel analyzer.
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Bachmann Claus C
Klein Albert P.
Laurila Melvin J.
Bruce David V.
Ho Allen C
Process Control, Inc.
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