Calculates neutron slowing-down length L_s and migration area M² = L_s² + L² (diffusion length) to estimate how far neutrons travel before absorption. In water-moderated reactors, M ≈ 6 cm — neutron leakage from small reactors is proportional to M²/size² and is a key criticality design parameter.
Inputs
D Cm
Reference formula or conversion factor shown for context.
Sigma A Per Cm
Reference formula or conversion factor shown for context.
Tau Cm2
Age in completed years. Many health and fitness formulas adjust for age.
Results
diffusion length L (cm)
The computed linear length.
migration length M (cm)
The computed linear length.
L² = D/Σa (cm²)
Reference formula or conversion factor shown for context.
M² = L² + τ (cm²)
Reference formula or conversion factor shown for context.
L = √(D/Σa) | M = √(L² + τ)
Reference formula or conversion factor shown for context.