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Linear Attenuation Coefficient

Applicable units are those of quantitykind:LinearAttenuationCoefficient

"Linear Attenuation Coefficient", also called the attenuation coefficient, narrow beam attenuation coefficient, or absorption coefficient, is a quantity that characterizes how easily a material or medium can be penetrated by a beam of light, sound, particles, or other energy or matter.

http://en.wikipedia.org/wiki/Attenuation_coefficient

http://www.iso.org/iso/catalogue_detail?csnumber=31895

$\mu = -\frac{1}{J}\frac{dJ}{dx}$, where $J$ is the magnitude of the current rate of a beam of particles parallel to the $x-direction$. Or: $\mu(\lambda) = \frac{1}{\Phi_\lambda(\lambda)}\frac{d\Phi_\lambda(\lambda)}{dl}$, where $\frac{d\Phi}{\Phi}$ is the relative decrease in the spectral radiant flux $\Phi$ of a collimated beam of electromagnetic radiation corresponding to the wavelength $\lambda$ during traversal of an infinitesimal layer of a medium and $dl$ is the length traversed.

$\mu$

"Linear Attenuation Coefficient", also called the attenuation coefficient, narrow beam attenuation coefficient, or absorption coefficient, is a quantity that characterizes how easily a material or medium can be penetrated by a beam of light, sound, particles, or other energy or matter.