Archetype Sub-90 Dry-Wipe Invariant (Nuclear Decay Chains (α, β⁻, γ), Isotope Algebra & Background-Corrected Half-Life Calculus): Decay chain 2-step rule: (1) Mass number A only changes via alpha: N(alpha) = (A(start) - A(end))/4. (2) Proton number: N(beta) = Z(end) - (Z(start) - 2*N(alpha)). For count rates: Net = Raw - Background.
sub90 ESATARCH-P-12: Nuclear Decay Chains (α, β⁻, γ), Isotope Algebra & Background-Corrected Half-Life CalculusPhysics
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SUB-90 ZONE (<25S)
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