The falling off of the energy density of radiation with distance from the source, or with passage through an absorbing or scattering medium.
Verbal noun of → attenuate.
Fr.: coefficient d'bsorption
The fraction of a beam of → X-rays or → gamma rays that is absorbed or scattered per unit thickness of the → absorber. The linear attenuation coefficient, denoted by the symbol μ, appears in the equation I(x) = I0e-μx, where I(x) is the intensity at depth of x cm and I0 is the original intensity.
Fr.: facteur d'atténuation
The ratio of the radiation intensity after traversing a layer of matter to its intensity before.