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

Half-value thickness

The quantity half-value thickness (d½) is the amount of material that reduces the intensity to half the original value. Instead of the linear half-value thickness (in m), often the mass half-value thickness ρd½ (in kg/m2) is given. Here, ρ is the density (in kg/m3) of the material.

The quantity attenuation coefficient (μ) describes how easily electromagnetic radiationthe penetrates into matter. The relation between half-value thickness and attenuation coefficient is:

μ = ln(2)/d½

Related quantities:

Last modified:15 January 2021 8.44 p.m.
View this page in: Nederlands