Calculation of radiation yield

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The number of photons per MeV per incident electron per [math]g/cm^2[/math] of radiator (Z,A) is given by [1]:

[math]\frac{d^2n}{d\kappa dt} = \frac{3.495 \times 10^{-4}}{A\kappa}[Z^2\Phi_n(Z,E_0,k)+Z\Phi_e(Z,E_0,k)](MeV^(-1)g^(-1)cm^2)[/math]