Specific physicochemical behavior of trace "hot" atoms during phase transitions in metals. IV. Behavior of trace rhenium atoms in metallic tungsten

The mass transfer of the trace "hot" Re-186 and Re-188 atoms formed in meta llic tungsten by the nuclear reactions W-186(n,gamma)W-187(n,gamma)W-188 -- > Re-188 and W-186(d,2n)Re-186 was studied by precision gamma-spectrometry. Accelerated diffusion of the trace atoms in the course of alpha --> gamma polymorphic transition of tungsten was detected; the rate and the degree of abnormal behavior depend on the nuclear history of the trace atoms. Basing on the whole series of works, the possibility is shown of using the experi mental data in settling certain fundamental problems in physics and chemist ry of the condensed state, nuclear chemistry, and radiochemistry such as in vestigations of the mass transfer of trace atoms in metals and alloys, phas e transitions and their mechanisms, physicochemical behavior of transmutati on radionuclides with various nuclear history, and development of new theor etical approaches to preparation of carrier-free radionuclides.