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15% kVp rule

mAs₂ = 10.26 mAs

mAs2=mAs1(kVp1kVp2)n\mathrm{mAs}_2=\mathrm{mAs}_1\left(\frac{\mathrm{kVp}_1}{\mathrm{kVp}_2}\right)^n

mAs that keeps exposure constant when kVp changes (film-screen n≈5).

Laser