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Article | REF: P950 V3

X-Ray Tomography

Author: Christian THIERY

Publication date: December 10, 2013, Review date: January 12, 2023

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1. Physical and mathematical principles

1.1 Attenuation of X-rays by matter

When a parallel beam of monochromatic X-rays of intensity I passes through a quantity of material of infinitesimal thickness dx at normal incidence, the transmitted beam is attenuated by the intensity dI :

dI=Iμ  dx

with :

μ
 : 
linear absorption coefficient.

This leads to Beer's law giving the intensity transmitted by a thickness x of the material:...

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