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Reference.org
Radiation length
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<p>In <a href="/facts/Particle_physics/YgIuyj2t">particle physics</a>, the radiation length is a characteristic of a material, related to the energy loss of high energy <a href="/facts/Elementary_particle/CTFDM97U">particles</a> electromagnetically interacting with it. It is defined as the <a href="/facts/Mean/swcEd4Pg">mean</a> length (in cm) into the material at which the energy of an <a href="/facts/Electron/L0KBo5cW">electron</a> is reduced by the factor 1/<a href="/facts/E_(mathematical_constant)/coEtSBk8"><i>e</i></a>. </p>