U-238 Decay Chain: Bateman Equations & Secular Equilibrium (2D)

This 2D companion models the real uranium-238 (radium) decay series — 14 radioactive daughters ending at stable lead-206 — by solving the coupled Bateman decay equations exactly, rather than animating single-atom decay. A time-window zoom lets you inspect any segment of the chain from microsecond-lived polonium-214 to the 4.5-billion-year decay of uranium-238 itself, watching each short-lived daughter reach secular equilibrium with its parent.