Leaching of radioactive nuclides from cement grouts. [Method for measuring rate of leaching of Cs-137 from cement grouts]
A method for measuring the rate of leaching of /sup 137/Cs from cement grouts was investigated as an alternate to the International Atomic Energy Agency (IAEA) method which requires long experimental times. The effects of curing time (10, 20, and 30 days) and the type of leachant (tap and saline water) on the amount of /sup 137/Cs leached were studied. Mathematical models for mass transport phenomena for both finite cylindrical geometry and a semi-infinite medium were developed to analyze the data. It was found that the models for diffusion of /sup 137/Cs with depletion of the species due to curing provided the best correlation of the data. The proposed method was found to give values of the mass transport coefficients within a factor of 2 to 10 of the IAEA test results. Diffusion coefficients were found to be in the range of 10/sup -9/ to 10/sup -11/ cm/sup 2//sec and depletion rate constants in the range of 10/sup -6/ to 10/sup -8/ sec/sup -1/.
- Research Organization:
- Massachusetts Inst. of Tech., Oak Ridge, Tenn. (USA). School of Chemical Engineering Practice
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 7343913
- Report Number(s):
- ORNL/MIT-194; TRN: 77-001924
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CEMENTS
LEACHING
CESIUM 137
AQUEOUS SOLUTIONS
CHEMICAL REACTION KINETICS
COMPARATIVE EVALUATIONS
DIAGRAMS
DIFFUSION
MASS TRANSFER
MATHEMATICAL MODELS
SODIUM CHLORIDES
TABLES
WATER
ALKALI METAL COMPOUNDS
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BUILDING MATERIALS
CESIUM ISOTOPES
CHLORIDES
CHLORINE COMPOUNDS
DISPERSIONS
DISSOLUTION
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
ISOTOPES
KINETICS
MATERIALS
MIXTURES
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
RADIOISOTOPES
REACTION KINETICS
SEPARATION PROCESSES
SODIUM COMPOUNDS
SOLUTIONS
YEARS LIVING RADIOISOTOPES
052002* - Nuclear Fuels- Waste Disposal & Storage