A Gamma-photoneutron Method for Laboratory Studies of Soil Water
1970
Corey, J. C. | Hawkins, R. H. | Overman, R. F.
The gamma-photoneutron method is unique among nuclear methods used to study water movement in soil because the heavy water (²H₂O) content of laboratory soil columns can be measured independently of bulk density of soil, soil texture, light water (¹H₂O) content, and type of clay mineral. The method requires a radioactive source that emits gamma photons in excess of 2.23 Mev and a neutron detector. The neutron detector measures photoneutrons produced when the deuterium nuclei in the gamma radiation field split into a photoneutron and a proton. The number of photoneutrons detected is linearly related to the heavy water content of the soil column.
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