of the bremsstrahlung in the $\alpha$-decay which takes a value of the angle between the directions of the $\alpha$-particle propagation (or tunneling) and the photon emission into account, should be constructed. In such direction two independent groups have developed the angular formalism in the semiclassical dipole approach including quadrupole term [@Boie.2007.PRL; @Jentschura.2008.PRC] and in the fully quantum approach [@Maydanyuk.nucl-th.0404013; @Maydanyuk.2006.EPJA; @Maydanyuk.2008.EPJA; @Maydanyuk.2008.MPLA; @Maydanyuk.2009.NPA] where wave function of photons was mainly expanded by spherical waves. In particular, the good agreement for the $^{210}{\rm Po}$ nucleus between experimental data and the calculated spectra in the approach [@Boie.2007.PRL; @Jentschura.2008.PRC] was obtained, neglecting by emission of photons from the internal nuclear region before the barrier. From such results it could follow that such internal emission of photons is extremely small and does not influence on the spectra. In such a case, it looks to be impossible to extract any useful information about processes of $\alpha$-decay inside the nuclear region before the barrier from experimental data of the bremsstrahlung. But, in order to clarify this the emission of photons from internal region should be estimated on the basis of fully quantum calculations based on the realistic potential between $\alpha$-particle and daughter nucleus. A question of 