G - Physics – 01 – N
Patent
G - Physics
01
N
358/12
G01N 23/223 (2006.01) G01N 23/22 (2006.01) G01N 23/225 (2006.01)
Patent
CA 1170375
ABSTRACT OF DISCLOSURE Method and apparatus for material analysis in which X-rays generated pursuant to incidence of an electron beam on the material are detected by a detector which generates signals representative of X-ray intensity. A first single channel analyser is connected to receive the signals from the detector and to pass to an associated first counter a count signal whenever the signal applied to the first single channel analyser is representative of an X-ray energy within a relatively narrow range of such energies. A second single channel analyser is also connected to receive the signals from the detector and to pass to an associated second counter a count signal whenever the signal applied to the second analyser is representative of an X-ray energy falling within a much broader range of such energies than the first-mentioned range. The first and second counters accumulate the count signals applied thereto. The count in the second counter is compared by a comparator with a pre-established count in a third counter and when the count in the second counter assumes the same value as the count in the third counter the counts in the first and second counters are held. The so held count in the first counter then itself represents a normalized ratio of X-ray energy within the narrow range to the X-ray energy for the energy spectrum represented by the broad range of energies. On the basis of this normalized ratio information as to the makeup of the material can be derived.
379416
Reid Alan F.
Zuiderwyk Martin A.m.
Commonwealth Scientific And Industrial Research Organization
Kirby Eades Gale Baker
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