Radioluminescence of curium(III) in solutions (in Russian)
The radioluminescence of curium(III) under the action of the intrinsic ..cap alpha..-radiation was studied in aqueous, heavy water, and organic solutions. The luminescence maximum falls at lambda approx. 600 nm. The yield of radioluminescence G is proportional to the concentration (or electronic fraction) of curium, and for a 10/sup -2/ M aqueous solution of Cm(NO/sub 3/)/sub 3/, G approx. 5 x 10/sup -4/ quanta per 100 eV of absorbed energy. In dilute acids the yield of radioluminescence is the same as in neutral solution, but in concentrated acid it is substantially changed. In the presence of ligands (formate, acetate, citrate ions, and others), the yield of the radioluminescence of curium in aqueous solutions increases, which is associated with complex formation, leading to a decrease in the quenching of excited curium by water molecules. The intensification of the radioluminescence of curium in the presence of sodium paratungstate is especially great; it is suggested that in this case a significant role is played by energy transfer from the ligand to curium. H/sub 2/O/sub 2/, NH/sub 2/NH/sub 2/, NH/sub 2/OH, Ce/sup (IV)/, and uranium, neptunium, and plutonium ions in various oxidation states have no great influence on the radioluminescence of curium. Its quenching by NpO/sub 2//sup +/ ions is somewhat greater than by other actinide ions and is associated with the formation of cation-cation complexes of NpO/sub 2//sup 2 +/ with Cm/sup 3 +/. In heavy water and organic solutions, a substantial increase in the radioluminescence yield of curium is observed, which is in good agreement with the data on photoluminescence. The results obtained suggest that the radioluminescence of curium in solutions (in the absence of energy-donor ligands) is excited mainly directly, while the role of energy transfer to curium from the solvent or its radiolysis products is negligible.
- OSTI ID:
- 6950456
- Journal Information:
- Sov. Radiochem. (Engl. Transl.); (United States), Vol. 28:3; Other Information: Translated from Radiokhimiya; 28: No. 3, 403-407(May-June, 1986)
- Country of Publication:
- United States
- Language:
- Russian
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
CURIUM COMPOUNDS
RADIOLUMINESCENCE
SOLUTIONS
MATERIALS TESTING
ALPHA PARTICLES
COMPARATIVE EVALUATIONS
COMPLEXOMETRY
DMSO
DTPA
ENERGY ABSORPTION
ENERGY TRANSFER
HEAVY WATER
HYDROCHLORIC ACID
LIGANDS
NEPTUNIUM COMPOUNDS
NITRIC ACID
OXIDIZERS
PERCHLORIC ACID
PLUTONIUM COMPOUNDS
QUANTITY RATIO
QUENCHING
REDUCING AGENTS
SODIUM TUNGSTATES
SULFURIC ACID
URANIUM COMPOUNDS
VALENCE
WATER
ABSORPTION
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
AMINO ACIDS
CARBOXYLIC ACIDS
CHARGED PARTICLES
CHELATING AGENTS
DISPERSIONS
DRUGS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LUMINESCENCE
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
RADIOPROTECTIVE SUBSTANCES
SODIUM COMPOUNDS
SULFOXIDES
TESTING
TRANSPLUTONIUM COMPOUNDS
TRANSURANIUM COMPOUNDS
TUNGSTATES
400201* - Chemical & Physicochemical Properties
400600 - Radiation Chemistry