Skip to ContentSkip to Navigation
Education Programmes Other study opportunities Groningen Academy for Radiation Protection

Attenuation coefficient

The quantity attenuation coefficient (μ) describes how easily electromagnetic radiationthe penetrates into matter. Instead of the linear attenuation coefficient (in m-1), often the mass attenuation coefficient μ/ρ (in m2/kg) is given. Here, ρ is the density (in kg/m3) of the material.

The quantity half-value thickness (d½) is the amount of material (in m) that reduces the intensity to half the original value. The relation between half-value thickness and attenuation coefficient is:

d½ = ln(2)/μ

Related quantities:

Last modified:15 January 2021 12.36 p.m.
View this page in: Nederlands