“…The terms appearing in eq. (3.2) can be estimated as explained in [28,35,36] and eq. (3.2) takes into account all the parameters influencing the bremsstrahlung photon production such as target material, electron scattering inside the target material B i (w), the electron energy loss [(T e ) i • k], the electron transmission coefficient τ(T e , d i T) and photon mass attenuation in the target.…”