Science Fair Project Encyclopedia
Attenuation length
Attenuation length, in high-energy and medical physics, is the distance τ into a material when the probability has dropped to 
that a particle has not been attenuated :
This curve has the same shape as the exponential decay curve and τ is material dependant.
In other words, it is the length of a particular material that you would need to stop a good portion (
or about 63%) of the particles traversing it.
Last updated: 05-08-2005 08:06:56
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details