The work of A.M. Gedz is devoted to one of the topical problems of isotope geology - the foundation and approbation of new minerals,which possible to use for direct dating the ore formation processes. The author obtained unique data indicating high helium safety in some sulphides, which allows us to consider them as promising minerals-geochronometers for the (U-Th) / He method of isotope dating. The work is written in a good language, contains all the necessary sections, clear graphical material, an extensive list of literature.  The noted shortcomings of work ____As remarks which do not detract from the general high level of the thesis, the following points can be noted: 1) the results (U-Th) / He of the pyrite samples subjected to acid treatment are not given; 2) a comparative analysis of the kinetics of helium thermal desorption of the studied sulfides and silicates (zircon, apatite, etc.) - the traditional minerals used for (U-Th) / He dating - has not been done thoroughly enough.  The reviewer's conclusion is _ The master's thesis "Migration of radiogenic helium in the crystalline structure of sulphides and the possibility of their isotope dating" deserves an excellent evaluation, and its author is Alexander Mikhailovich Gedz assigning a master's degree in the direction 05.04.01 Geology