Английская Википедия:Attenuation length
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In physics, the attenuation length or absorption length is the distance Шаблон:Mvar into a material when the probability has dropped to Шаблон:Math that a particle has not been absorbed. Alternatively, if there is a beam of particles incident on the material, the attenuation length is the distance where the intensity of the beam has dropped to Шаблон:Math, or about 63% of the particles have been stopped.
Mathematically, the probability of finding a particle at depth Шаблон:Mvar into the material is calculated by the Beer–Lambert law:
- <math>P(x) = e^{-x /\lambda} \!\,</math>.
In general Шаблон:Mvar is material- and energy-dependent.
See also
- Beer's Law
- Mean free path
- Attenuation coefficient
- Attenuation (electromagnetic radiation)
- Radiation length
References
- Шаблон:Cite journal
- https://web.archive.org/web/20050215215652/http://www.ct.infn.it/~rivel/Glossario/node2.html
External links
