The x-ray absorption is the uptake of energy or the decrease of the number of photons by the tissue or matter through which the radiation travels. Absorption in nuclear reactions and particulate radiation is a process of taking up kinetic energy of particles or the combination of particles with an atom, a nucleus, or another particle. Absorption characteristics of imaged tissues are represented by their linear attenuation coefficients.
See also Absorber.
Absorbers consist of material that stops ionizing radiation. For example, lead, steel and concrete attenuate x-rays. Alpha particles and most beta particles can be stopped or absorbed by a sheet of paper or thin metal.
The absorption depends on the atomic number, density, thickness, etc. of the used material.
The interactions between the radiation and the absorber are three major processes: photoelectric
absorption, Compton scattering, and pair production.
See also Absorption.
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