Specificity of behavior of impurity radioactive ``hot``atoms upon phase transitions in metals
- St. Petersburg State Univ. (Russian Federation)
The main objective of these studies was to reveal some general trends of the physical and chemical behavior of the ultra-small amounts of impurities of various nuclear-induced origin and their previous history in irradiated metals that had undergone structural transformations. To tackle the problem, an original methodological approach has been applied based on a complex use of various nuclear-physical methods: (1) emission and absorption nuclear gamma resonance spectroscopy; (2) Mossbauer spectroscopy of secondary electrons ({sup 119}Sn); (3) X-ray structural and phase analysis; and (4) radioisotopic techniques used to study mass-transport processes (gamma-ray self-absorption method, sectioning method, and Langmuir method). To study the transport properties of radioactive impurity atoms {sup 113m}In and {sup 188}Re, the new method was used. An interrelation has been revealed between the electronic and crystallographic state of the hot impurity atoms, as also between their physical and chemical behavior and structural changes occurring in the bulk or in the surface phase of irradiated metals. Also revealed were abnormalities in the diffusion behavior of impurities in the bulk and in the surface phase of irradiated metals, as well as in their physical and chemical behavior at the metal-gas interface during cold rolling and thermally induced reconstructive phase transitions (surface phase transitions, polymorphous transitions, melting, thermal annealing of structural radiation damage after nuclear transformation): accelerated transport of impurity atoms to the metal surface and their exit in the gaseous phase (because of the formal similarity with the classic emanation phenomena of emanation of inert gases and volatile fission products out of crystalline salts, the observed phenomenon has been named quasi emanation).
- OSTI ID:
- 678107
- Report Number(s):
- CONF-990605-; ISSN 0003-018X; TRN: 99:009092
- Journal Information:
- Transactions of the American Nuclear Society, Vol. 80; Conference: 1999 annual meeting of the American Nuclear Society (ANS), Boston, MA (United States), 6-10 Jun 1999; Other Information: PBD: 1999
- Country of Publication:
- United States
- Language:
- English
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