# Attenuation Coefficient

(redirected from Mass Attenuation Coefficient)
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## attenuation coefficient

[ə‚ten·yə′wā·shən ‚kō·ə′fish·ənt]
(electromagnetism)
The space rate of attenuation of any transmitted electromagnetic radiation.

## Attenuation Coefficient

(or extinction coefficient), a quantity inverse to the distance at which the radiation flux forming a parallel beam is attenuated as a result of the joint action of the absorption and scattering of light in a medium by a specified factor. When the factor is 10, the coefficient is called the decimal attenuation coefficient, and when the factor is e, it is called the natural attenuation coefficient. The attenuation coefficient is the sum of the absorption coefficient and the scattering coefficient of the medium. These coefficients depend on the set of frequencies v, or wavelengths λ, that characterize the initial flux. The value of the attenuation coefficient for the limiting case of a single frequency v is called the monochromatic attenuation coefficient. Like the absorption and scattering coefficients, the attenuation coefficient can be divided by the volume of the medium or by the mass of the attenuating substance; we shall call these two ratios the volume and mass attenuation coefficients, respectively.

References in periodicals archive ?
Calculated values will depend on the choice of mass attenuation coefficients used to account for the source encapsulation.
The mass attenuation coefficient is a material property of the mat that can be determined by a calibration experiment or from literature (Olson and Arganbright 1981, Moschler and Dougal 1988, Cullity and Stock 2001).
1]) will determine the density of a given specimen with a known mass attenuation coefficient and the penetration thickness.

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