On the structure of the Mössbauer spectra of $^{119m}$Sn impurity atoms in lead chalcogenides under conditions of the radioactive equilibrium of $^{119m}$Te/$^{119}$Sn isotopes

The method of Mössbauer emission spectroscopy with $^{119m}$Te and $^{119}$Sb parent isotopes in the radioactive-equilibrium state is used to obtain information on the localization and valence state of $^{119m}$Sn daughter atoms formed from the $^{119}$Sb and $^{119m}$Te parent atoms at cation and anion sites of the lattice of PbSe and PbTe lead chalcogenides.