A laboratory method, based on gamma -radiation attenuation, is described for studying transient water flow in packed soil columns. The gamma rays from a 200-mc source of Cs/sup 137/ are collimated through a narrow slit, and the beam is then focused on a soil column. A radiation analyzer in the circuit allows only primary rays of energy 0.66 plus or minus 0.15 Mev to be recorded. Both bulk density (g/cm/sup 3/) and water content of the soil (g/cm/ sup 3/) can be calculated using an absorption equation. The method makes possible rapid and frequent measurement of the water content of soil as a function of time and position without disturbing the soil-water system. Experimental results for water moving into a uniformly packed air-dry soil are presented. (auth)
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Davidson et al. (1963) studied this question.
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