Polynomial approximation of the bremsstrahlung spectra for a thick target in the 10-22 MeV electron energy range

The polynomial approximation of the bremsstrahlung spectra from a thick target is proposed. The polynomial coefficient have been calculated for the bremsstrahlung target consisting of 0.2 cm W and 3.0 cm Al in the 10 MeV <= Esub(e) <= 22 MeV electron energy range and in 1 MeV <= k <= 0.95 Esub(e) γ-quanta energy range. The accuracy of representation was better than 10% over all energy range. The polynomial approximation of bremsstrahlung spectra permits to simplify the processing of the experimental results and provides a possibility to take into account the effect of energy spread of the electron beam on the shape of bremsstrahlung spectrum