Method of imaging the atomic number of a sample

Details Method of imaging the atomic number of a sample Method of imaging the atomic number of a sample

1983-12-29

1986-02-18

Howell, Janice A.

Radiant energy

Calibration or standardization methods

378207, G01D 1800

Patent

active

045714916

ABSTRACT:
A method of obtaining an atomic number image of an unknown material. A plurality of calibration materials which have a plurality of different known atomic numbers and densities are scanned with a CAT at first and second energies to determine the attenuation coefficients for the plurality of calibration materials at these energies. The energy-dependent coefficients at the first and second energies are determined from the attenuation coefficients for the plurality of calibration materials at the first and second energies according to a predetermined relation. The unknown material is scanned with a CAT at the first and second energies to determine the attenuation coefficients at a plurality of points in a cross section of the unknown material at these energies. The determined energy-dependent coefficients and the determined attenuation coefficients for the unknown material at the first and second energies are used to determine an atomic number image for the unknown material.

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