In the paper an exact solution of the contact initial-boundary value problem is found for diffusion of decaying admixture particles in a body of a two-phase periodical stratified structure. Regularities of concentration distributions are studied to depend upon different values of a coefficient of the migrating substance.s decay intensity. Conditions are established for the existence of a passage to the limit from contact initial-boundary value problems of the decaying substance diffusion to continual models of heterodiffusion by two ways allowing for the decay process. An exact solution for the partial Fisher problem for a layer is found. Mass flows are defined for the decaying admixture whose particles migrate in a horizontally regular structure.
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