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RAD-10

Tenth-value layer

TVL = ln 10 / μ ≈ 3.32 HVL. Thickness that cuts a narrow beam by ten.

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AttenuationTVL

Governing equation

TVL=ln⁡10/μ\mathrm{TVL}=\ln 10/\mu

where

\mu
Linear attenuation (1/cm)
TVL
Tenth-value layer (cm)
HVL
Half-value layer (cm)

Lecture brief

Historical brief

Beer attenuation, Compton (1923), Klein–Nishina, Bragg–Gray cavity and KERMA are the transport of photons and charged particles in matter. The sheets compute fluence, kerma and stopping. This sheet (RAD-10 — Tenth-value layer) is the form associated with TVL. Working symbols: μ\mu →\rightarrow TVLTVL, HVLHVL. Shielding rooms are quoted in TVLs. Broad-beam TVL includes a build-up.

Purpose

Purpose: compute TVLTVL, HVLHVL from μ\mu in Radiation physics via TVL=ln⁡10/μ\mathrm{TVL}=\ln 10/\mu TVL = ln 10 / μ ≈ 3.32 HVL. Thickness that cuts a narrow beam by ten. Use it when a real radiation physics question must be answered in SI before a code check.

Live realistic example

In symbols

Live case. Given μ=0.400 1/cm\mu = 0.400\,\mathrm{1/cm}, the governing relation TVL=ln⁡10/μ\mathrm{TVL}=\ln 10/\mu yields TVL=5.756 cmTVL = 5.756\,\mathrm{cm}, HVL=1.733 cmHVL = 1.733\,\mathrm{cm}. A thick wall, a 10× drop. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Outputs

  • Tenth-value layer TVL5.756 cm
  • Half-value layer HVL1.733 cm
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RAD-10 · decay
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Narration of this film

A thick wall, a 10× drop.

Shielding rooms are quoted in TVLs. Broad-beam TVL includes a build-up.

Reading speed

Watch on YouTube