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Mayneord F-factor

F = 1.026

F=(SSD2+dmax⁡SSD1+dmax⁡)2(SSD1+dSSD2+d)2F = \left(\frac{\mathrm{SSD}_2+d_{\max}}{\mathrm{SSD}_1+d_{\max}}\right)^2\left(\frac{\mathrm{SSD}_1+d}{\mathrm{SSD}_2+d}\right)^2

PDD correction when SSD changes at constant surface field size.

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