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Soil Science Society of America Journal Abstract -

Temperature Stabilization of Gamma Ray Transmission Equipment1


This article in SSSAJ

  1. Vol. 34 No. 1, p. 152-153
    Received: June 19, 1969
    Accepted: Sept 23, 1969

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  1. Robert J. Reginato and
  2. Karl Stout2



Accurate measurements of water content of soil in situ can now be made using an improved gamma ray transmission method. Prior to this development, existing equipment tried in the field responded to temperature fluctuations as well as density and water content changes. With the new method, the nuclear counting system is stabilized on a reference 60Co gamma ray source attached to the detector assembly. Density changes are then measured with a 137Cs gamma ray source about 30 cm away from the detector. In laboratory tests, similar attenuated count rates were obtained for 137Cs gamma rays through a standard absorber while the temperature was varied from 5 to 33C.

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