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Pair-production Z² scaling

κ₂/κ₁ = 418.8

κ∝Z2(E−1.022),E>1.022 MeV\kappa \propto Z^2(E-1.022),\quad E>1.022\,\mathrm{MeV}

Pair (and triplet) production rises as Z² above 1.022 MeV.

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