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- W280034005 abstract "Tritium, when released as tritiated water at a point in a uniform and relatively dry soil redistributes in both the liquid and vapor phases. The flux density of tritium in each phase is of the same order of magnitude however so tritium redistribution must be modelled recognizing transfer ``in parallel`` in both phases. We use the diffusion equation cast in radial (spherical) coordinates to analyze this problem, taking into account radioactive decay. Specifically, we present a solution for the case of 1 million Curies of tritium diluted in 1 liter of water and released at a depth of 20 meters in soil with an initial water volume fraction of 0.06 and volume fraction of air of 0.24. The mathematical solution permits calculation of the evolution in time, of radial profiles of tritium concentration, within and external to the sphere of released solution, assuming the initial concentration within this sphere to be uniform. We also predict the rate of advance of the maximum of tritium as it advances, and attenuates, in the soil. Calculations show, for example, that at 5 meters from the point of discharge, the tritium concentration increases to a maximum in 108 years and then slowly declines. Thatmore » maximum concentration is 49 picoCuries/liter. At 10 meters the predicted maximum is reached in 276 years but it will never achieve the present lower limit of radiochemical detection. We illustrate the effects of variation in the volume fractions of water and air originally present in the soil on the effective diffusion coefficient of tritium in soil. We consider the effects of a net flux of water in the system, and identify questions to be answered to achieve safe systematic disposal of tritium in the deep unsaturated zone of desert soil.« less" @default.
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- W280034005 date "1993-01-01" @default.
- W280034005 modified "2023-09-27" @default.
- W280034005 title "Three dimensional redistribution of tritium from a point of release into a uniform unsaturated soil. A deterministic model for tritium migration in an arid disposal site" @default.
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