Attenuation Length

Attenuation length, in high energy and medical physics, is the distance \tau into a material when the probability has dropped to \frac{1}{e} that a particle has not been attenuated: P(x) = e^{-(\frac{x}{\tau})} This curve has the same shape as the exponential decay curve and \tau is material dependant. In other words, it is the length of a particular material that you would need to stop a good portion (1 - \frac{1}{e} or about 63%) of the particles traversing it.

 

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