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Alpha-recoil damage in monazite: preferential dissolution of the radiogenic actinide isotopes

Journal Article · · Nucl. Technol.; (United States)
OSTI ID:6132207
;

A preferential dissolution by a factor of 1.1 to about 10 of the radiogenic nuclides /sup 234/U, /sup 230/Th, and /sup 228/Th relative to their corresponding structurally incorporated isotopes /sup 238/U and /sup 232/Th has been observed upon leaching of natural monazite samples in a bicarbonate-carbonate solution. This isotopic fractionation may be attributed to radiation damage caused by alpha recoil atoms. The observations have implications for the storage of crystalline nuclear waste forms in deep geological formations. The damage may endanger the integrity of any crystalline phase that contains alpha-emitting nuclides in groundwater environments. It is inferred that in monazite-like phases the overall alpha-recoil damage may increase nearly in proportion to the alpha-particle dose over the long time range ( about 10/sup 5/yr) required for the isolation of actinide wastes.

Research Organization:
Technion-Israel Institute of Technology Department of Nuclear Engineering, Haifa, Israel
OSTI ID:
6132207
Journal Information:
Nucl. Technol.; (United States), Journal Name: Nucl. Technol.; (United States) Vol. 58:1; ISSN NUTYB
Country of Publication:
United States
Language:
English

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Related Subjects

052002 -- Nuclear Fuels-- Waste Disposal & Storage
053000 -- Nuclear Fuels-- Environmental Aspects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
360605* -- Materials-- Radiation Effects
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY
ALPHA DECAY RADIOISOTOPES
CRYSTALLIZATION
DECAY
DISSOLUTION
EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPE RATIO
ISOTOPES
LEACHING
MATERIALS
MINERALS
MONAZITES
NUCLEI
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RADIATION EFFECTS
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
RADIOISOTOPES
RARE EARTH COMPOUNDS
RECOILS
SEPARATION PROCESSES
THORIUM 228
THORIUM 230
THORIUM COMPOUNDS
THORIUM ISOTOPES
THORIUM MINERALS
THORIUM PHOSPHATES
URANIUM 234
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES