Diffusion of Tritiated Water in Soils
1963
Nakayama, F. S. | Jackson, R. D.
The apparent diffusion coefficient of tritiated water (DTHO) was measured in four soil materials and two sizes of glass beads at about 40% water content by volume, and in agar gel. The apparent tritiated water diffusion coefficient may include diffusion in the liquid, vapor, and possibly adsorbed phases. For Pachappa loam, DTHO was determined in detail as a function of water content. The DTHO was nearly constant for volumetric water contents of 10 to 40%. As the water content decreased below 10%, the DTHO rapidly increased to a maximum at about 4% water content, then rapidly decreased as the water content was further reduced. The maximum value of DTHO is 3.5 times greater than DTHO at 40% water content.
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