Method and device for determining the attenuation function of an object with respect to the transmission of a reference material thickness
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United States of America Patent
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Nov 11, 1997
Grant Date -
N/A
app pub date -
Sep 5, 1996
filing date -
May 28, 1993
priority date (Note) -
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Abstract
The object's transmission function is expressed as a finite power expansion of a reference-material reference thickness, each expansion power being equal to a ratio of a reference-material thickness to the reference thickness; the expansion coefficients are determined from the measurements of the intensities transmitted by the selected various thicknesses, including zero thickness, of the reference material exposed to a test beam evincing consecutively several energy spectra and from the measurements of the intensity transmitted by the object exposed to this same variable-spectrum test beam; the attenuation function is derived from the determination of the transmission function.
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