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Photoelectric scaling

ratio = 544.7

(τ/ρ)2(τ/ρ)1≈(Z2Z1)n(E1E2)m\frac{(\tau/\rho)_2}{(\tau/\rho)_1} \approx \left(\frac{Z_2}{Z_1}\right)^n\left(\frac{E_1}{E_2}\right)^m

τ/ρ scales roughly as Zⁿ / Eᵐ between absorption edges.

Laser