Abstract
The radiation and thermal annealing of neutron-activated single crystals and polycrystalline K2CrO4 has been investigated by measuring the 51Cr distribution among aqueous 51Cr(VI), 51Cr(III)-monomer, and 51Cr(III)-dimer species following dissolution. Radiation annealing up to 75 Mrad doses and thermal annealing in the temperature interval –78° to 300°C are attributed to at least seven crystal phase 51Cr-containing species. Six well-separated thermal annealing reactions occur between –78° and 300°C in single crystals receiving a γ-dose less than 1 Mrad during reactor irradiation. The fine structure of the thermal annealing curves is lacking in polycrystalline K2CrO4 and in single crystals receiving more than 3-4 Mrad in pile γ-dose. Three radiation annealing reactions take place in both polycrystalline and single crystals of K2CrO4 for doses up to 75 Mrad, but the reactions are different at low doses (0-5 Mrad) in the two types of crystals. The annealing eactions have been studied both in the presence and absence of air. The influence of the annealing atmosphere depends to a large extent on the crystal perfection.
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