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Attenuation cross section, customarily denoted by Cc [length2], is defined for a particle by the following equation (for example, Bohren and Huffman 1983):
| Cc = Φcp / E | (1) |
where Φcp [power] is the power of the electromagnetic radiation (ER) attenuated by the particle, and E [power length-2] is the irradiance of the ER beam illuminating the particle.
The attenuation cross section is related to the attenuation coefficient by the following equation (see Absorption cross section for a parallel derivation):
| Cc = c / n | (2) |
where c [length-1] is the attenuation coefficient of a dispersion and n [length-3] is the number concentration of particles in the dispersion. Eq. 2 serves as an operational definition of the attenuation cross section
| CITATION: Jonasz M. 2006. Attenuation cross section (www.tpdsci.com/Tpc/AtnCs.php). In: Top. Part. Disp. Sci. (www.tpdsci.com). |
HISTORY: Published: 07-Mar-2006 Modified: 07-Sep-2006 Peer-reviewed: 19-Feb-2007 |
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