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D₂O-Na²⁴ Method for Tracing Soil Moisture Movement in the Field¹

ABSTRACT

A unique method is described for measuring unsaturated flow of water in the field with D₂O tracer, a Na²⁴ gamma source, and a slow-neutron detector. The interaction of gamma radiation of energy greater than 2.23 Mev. and deuterium produces photoneutrons. The Na²⁴ gamma source and the slow-neutron detector are contained in a modified neutron-type soil moisture probe. The method successfully measured vertical movement of deuterium tracer in a Gilead sandy loam with the aid of access tubes.

¹ Contribution from Savannah River Plant, E. I. duPont de Nemours and Company, Aiken, South Carolina. Information in this article was developed during the course of work under Contract AT(07-2)-1 with the U.S. Atomic Energy Commission. Presented before Div. S-1, Soil. Sci. Soc. Am., Nov. 18, 1963, at Denver, Colo.

² Engineer and Chemist, Health Physics Section, E. I. duPont de Nemours & Company, Aiken, S.C. The senior author is now Engineer, Glidden Paint Co., Jacksonville, Fla.

Received for publication December 9, 1963. Accepted for publication May 25, 1964.