HVL = ln 2 / μ: thickness halving narrow-beam intensity

Layer 1 — Physicsin the medical-physics subtree

Half-value layer (HVL) is the thickness of absorber that halves the narrow-beam intensity under Beer-Lambert attenuation: I₀ · exp(−μ · HVL) = I₀ / 2, giving HVL = ln 2 / μ. Equivalent forms at different absorber thicknesses: thickness…

Related concepts

Mass attenuation coefficient μ/ρ
Dosimetry: Gy, Sv, dose-response
μ·HVL = ln 2; TVL/HVL = log(10)/log(2) ≈ 3.32
exp(−μ·n·HVL) = 2^{−n}: 1/2, 1/4, 1/8 at n=1,2,3; 1/1024 at n=10

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