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What (who) is absorption coefficient - definition
![NIST]]'s XCOM database.](https://commons.wikimedia.org/wiki/Special:FilePath/Attenuation Coefficient Iron.svg?width=200 "NIST]]'s XCOM database.")
!['''Mass attenuation coefficient''' values shown for all elements with [[atomic number]] Z smaller than 100 collected for photons with energies from 1 keV to 20 MeV. The discontinuities in the values are due to [[absorption edge]]s which were also shown.](https://commons.wikimedia.org/wiki/Special:FilePath/Photon Mass Attenuation Coefficients.png?width=200 "'''Mass attenuation coefficient''' values shown for all elements with [[atomic number]] Z smaller than 100 collected for photons with energies from 1 keV to 20 MeV. The discontinuities in the values are due to [[absorption edge]]s which were also shown.")
Wikipedia
The linear attenuation coefficient, attenuation coefficient, or narrow-beam attenuation coefficient characterizes how easily a volume of material can be penetrated by a beam of light, sound, particles, or other energy or matter. A coefficient value that is large represents a beam becoming 'attenuated' as it passes through a given medium, while a small value represents that the medium had little effect on loss. The SI unit of attenuation coefficient is the reciprocal metre (m−1). Extinction coefficient is another term for this quantity, often used in meteorology and climatology. Most commonly, the quantity measures the exponential decay of intensity, that is, the value of downward e-folding distance of the original intensity as the energy of the intensity passes through a unit (e.g. one meter) thickness of material, so that an attenuation coefficient of 1 m−1 means that after passing through 1 metre, the radiation will be reduced by a factor of e, and for material with a coefficient of 2 m−1, it will be reduced twice by e, or e2. Other measures may use a different factor than e, such as the decadic attenuation coefficient below. The broad-beam attenuation coefficient counts forward-scattered radiation as transmitted rather than attenuated, and is more applicable to radiation shielding.
