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sci.shielding-half-value-layer Calculator
Calculates half-value layer HVL = 0.693/µ and tenth-value layer TVL = 2.303/µ for gamma and X-ray shielding design from attenuation coefficient µ. Lead HVL for 1 MeV gamma: 1.25 cm — concrete: 11 cm; water: 16 cm — concrete is preferred for large-volume shields due to lower cost.
Inputs
Mu Cm Inv
Reference formula or conversion factor shown for context.
Thickness Cm
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
I0
Reference formula or conversion factor shown for context.
Energy Kev
Capacity to do work (J or kWh). Conserved — converts between forms but total stays constant in a closed system.
Results
transmitted intensity I
Sample size or count used in the calculation.
intensity reduction
Sample size or count used in the calculation.
half-value layer HVL (cm)
The computed numeric or monetary value.
tenth-value layer TVL (cm)
The computed numeric or monetary value.
I = I₀·exp(-μx)
Reference formula or conversion factor shown for context.