Closed-form Q-value computation for the α-decay ²²⁶Ra → ²²²Rn + α using tabulated atomic masses (AME2020; exact to 6 significant figures, pinned as sympy Rationals). m(²²⁶Ra) = 226.025410 u; m(²²²Rn) = 222.017578 u; m(⁴He) = 4.002602 u. …
Closed-form Q-value computation for the α-decay ²²⁶Ra → ²²²Rn + α using tabulated atomic masses (AME2020; exact to 6 significant figures, pinned as sympy Rationals). m(²²⁶Ra) = 226.025410 u; m(²²²Rn) = 222.017578 u; m(⁴He) = 4.002602 u. …