Efeitos termicos e radioliticos em cristais de K2CrO4 dopados com 51Cr

AUTOR(ES)
DATA DE PUBLICAÇÃO

1980

RESUMO

Fractional distributions of the various Cr labelled aqueous species were determined by cation exchange chromatography, after dissolution of K2CrO4 crystals containing dopant atoms of Cr. These aqueous distributions are related to precursors species in the solid phase. The behavior of Cr(III)-doped K2CrO4 crystals, when irradiated with gamma-ray photons, is strongly dependent on the temperature of irradiation and on the method used for doping. The numerical results obtained for the distribution of the various solution phase species labelled with Cr are not consistent with those found in the literature for samples having a similar history and are different from those obtained after the irradiation af K2CrO4 crystals with neutrons, indicating that the chemical ambient inside doped crystals must be different from that in crystals activated by neutron irradiation. Some mechanistic suggestions, based on reactions which involve solid state electronic species, developed initially to explain the behavior of some neutron irradiated solids, are presented to account in a general way for the observed products. The measured activities of the species are interpreted in terms of the formation of defect species and their interactions in the solid state. The reactions af these defect species with dopant atoms at the moment of the dissolution in a aqueous medium give the detected solution phase species.

ASSUNTO(S)

radioquimica

ACESSO AO ARTIGO

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