Nuclear physics
Decay chains, binding, shielding, and reactors
Exponential decay
N(t), activity
Bateman 2-chain
Parent→daughter
Half-life converter
τ, t½, λ
Bethe–Weizsäcker
B/A liquid drop
Reaction Q-value
Mass excess kinematics
γ shielding
I/I₀ = e^{-μx}
Stopping power sketch
dE/dx ∝ 1/β² toy
Fission energy
≈200 MeV scale split
Neutron moderation
Lethargy / ξ
Activity units
Bq, Ci, dps