Angular Distribution in Electron-Photon Showers without the Landau Approximation

The track-length angular distribution of electrons in an electron-photon cascade is calculated without the use of the Landau approximation which was invariably used in all previous work. The Tamm-Belenky model of the cascade is used. The results are presented in the form of a series, the first term of which is of the same form as the result yielded by the Landau approximation but with a modified value of the parameter $E_s$.