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.
Famous quotes containing the word length:
“The value of life lies not in the length of days but in the use you make of them; he has lived for a long time who has little lived.”
—Michel de Montaigne (1533–1592)