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Model of angular bremsstrahlung of photons emitted during $\alpha$-decay ispresented. A special emphasis is given on development of unified formalism ofmatrix elements in the dipole and multipolar approaches. A probability of theemission of photons calculated on the basis of the multipole model without anynormalization on experimental data (i. e. in absolute scale) is found at$90^{\circ}$ of the angle $\vartheta_{\alpha\gamma}$ between directions ofmotion of the $\alpha$-particle (with its tunneling under barrier) and emissionof photons to be in a good agreement with the newest experimental data for the$^{210}{\rm Po}$, $^{214}{\rm Po}$, and $^{226}{\rm Ra}$ nuclei. The spectrumfor $^{244}{\rm Cm}$ is found at $\vartheta_{\alpha\gamma} = 25^{\circ}$ to bein satisfactory agreement with high limit of errors of experimental data ofJapanese group. A comparative analysis for the spectra calculated for$^{210}{\rm Po}$ by the multipole and dipole approaches in the absolute scaleand with normalization on experimental data is performed. The emission ofphotons from the internal well in the dipole approach is found to be not smallwhile the multipolar approach does not show such a strong dependence.Distribution of the bremsstrahlung probability on the numbers of protons andnucleons of the $\alpha$-decaying nucleus in selected region close to$^{210}{\rm Po}$ is obtained. An unified formula of the bremsstrahlungprobability during the $\alpha$-decay of arbitrary nucleus expressed directlythrough the $Q_{\alpha}$-value and numbers $A_{p}$, $Z_{p}$ of nucleons andprotons of this nucleus is proposed.

Angular bremsstrahlung during $\alpha$-decay, emission from the internal region and unified formula of the bremsstrahlung probability