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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 dependent.
See also 
- Beer's Law
- Mean free path
- Attenuation coefficient
- Attenuation (electromagnetic radiation)
- Radiation length
- S. Eidelman et al. [Particle Data Group], Review of particle physics, Phys. Lett. B 592 (2004) (http://pdg.lbl.gov/)
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