Calculates half-value layer (HVL = ln2/µ) and tenth-value layer (TVL = ln10/µ) for shielding design from linear attenuation coefficients. HVL for 6 MV X-rays in concrete: ≈ 34 cm — radiotherapy vault walls are typically 2–3 m thick concrete to achieve 10⁻³ primary attenuation.
Inputs
Hvl Cm
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 Gy Hr
Amount of medication administered per period. Most dosing is weight-based — verify with a licensed prescriber before clinical use.
Results
attenuated dose rate I (Gy/hr)
Radiation dose received per unit time (Gy/hr or Sv/hr). Determines required shielding and exposure time limits.
attenuation factor I/I₀
A dimensionless multiplier applied in the calculation.
tenth-value layer TVL (cm)
The computed numeric or monetary value.
linear attenuation coefficient μ (cm⁻¹)
The value at the specified point or condition.
I = I₀·exp(−μx) = I₀·(½)^(x/HVL)
Reference formula or conversion factor shown for context.
HVL guide (photons)
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).