Intel 8253: Difference between revisions
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In [[physics]], the '''attenuation length''' or '''absorption length''' is the [[distance]] <math>\lambda</math> into a material when the [[probability]] has dropped to <math>1/e</math> that a [[Elementary particle|particle]] has ''not'' been [[Absorption (electromagnetic radiation)|absorbed]]. Alternatively, if there is a beam of particles incident on the material, the attenuation length is the distance where the [[intensity (physics)|intensity]] of the beam has dropped to <math>1/e</math>, or about 63% of the particles have been stopped. | |||
Mathematically, the probability of finding a particle at depth ''x'' into the material is calculated by [[Beer-Lambert law]]: | |||
:<math>P(x) = e^{-x /\lambda} \!\,</math>. | |||
In general <math>\lambda</math> is material and energy dependent. | |||
==See also== | |||
* [[Beer's Law]] | |||
* [[Mean free path]] | |||
* [[Attenuation coefficient]] | |||
* [[Attenuation (electromagnetic radiation)]] | |||
* [[Radiation length]] | |||
==References== | |||
* S. Eidelman ''et al.'' [Particle Data Group], ''Review of particle physics'', Phys. Lett. B '''592''' (2004) (http://pdg.lbl.gov/) | |||
* http://www.ct.infn.it/~rivel/Glossario/node2.html | |||
==External links== | |||
* http://henke.lbl.gov/optical_constants/atten2.html | |||
[[Category:Particle physics]] | |||
[[Category:Experimental particle physics]] | |||
{{particle-stub}} | |||
Revision as of 21:48, 30 December 2013
Template:No footnotes In physics, the attenuation length or absorption length is the distance into a material when the probability has dropped to 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 , or about 63% of the particles have been stopped.
Mathematically, the probability of finding a particle at depth x into the material is calculated by Beer-Lambert law:
- .
In general is material and energy dependent.
See also
- Beer's Law
- Mean free path
- Attenuation coefficient
- Attenuation (electromagnetic radiation)
- Radiation length
References
- S. Eidelman et al. [Particle Data Group], Review of particle physics, Phys. Lett. B 592 (2004) (http://pdg.lbl.gov/)
- http://www.ct.infn.it/~rivel/Glossario/node2.html