# Difference between revisions of "Linear attenuation coefficient"

### From Online Dictionary of Crystallography

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+ | <font color="red">Absorptionskoeffizient, linearer Schwächungskoeffizient</font> (''Ge''). <font color="green">Coeficiente de atenuación lineal</font> (''Sp''). | ||

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== Definition == | == Definition == | ||

## Latest revision as of 18:07, 14 November 2017

Absorptionskoeffizient, linearer Schwächungskoeffizient (*Ge*). Coeficiente de atenuación lineal (*Sp*).

## Definition

The linear attenuation coefficient [math]\mu(E)[/math], or preferably [math]\mu_{TOT}(E)[/math] in cm^{−1}, is a measure of the photon beam attenuation by a material due to absorption and scattering processes and hence differs from the absorption coefficient, which is a measure of beam attenuation due to absorption processes only.

[math]\mu_{TOT}(E)[/math] is given by

[math]\mu_{tot} = \Big[{\mu\over\rho}\Big]_{TOT}\rho[/math]

where [math]\rho[/math] is the density of the material in g cm^{−3}.

## History

Coefficients for converting between these units are given by many authors [Cohen, E. R. and Taylor, B. N. (1987). *Rev. Mod. Phys.* **59**, 1121-1148; Creagh, D. C. and McAuley, W. J. (1992). *International Tables for Crystallography, Volume C*, ed. A. J. C. Wilson, Dordrecht: Kluwer; Chantler, C. T. (1995). *J. Phys. Chem. Ref. Data* **24**, 71-643].