Definition: Attenuation of light refers to the reduction in the intensity of light as it travels through a medium. This loss is due to a number of factors. The light:Based on measurements of Delta A at two or more wavelengths, the resultant system of equations can be solved for the concentration changes of oxy- and deoxyhemoglobin. Note that the oxy- and deoxyhemoglobin absorption spectra in literature are usually provided in terms of epsilon , the molar decadic absorption coefficient (unit: L mol^{-1} -1 cm^{-1} -1 or M^{-1}-1 cm^{-1}-1).

Alternative definition:



Related terms: Absorption, Scattering, Extinction, Optical Density, Modified Beer-Lambert Law  

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