Field measurement of soil-water content by gamma-ray transmission compensated for temperature fluctuations
1971
Reginato, R.J. | Jackson, R.D.
Soil-water content under natural field conditions was measured with a gamma-ray transmission technique that compensated for temperature changes. A spectrum stabilizer was needed for the nuclear counting equipment, and a knowledge of the relationship between peak count-rate and the temperature of the gamma-ray detector probe was required. Equipment and procedures to make field measurements of water content in 1-cm-thick soil layers are described. When the detector probe temperature varied 23C and gravimetric water content ranged from 0.021 to 0.186 gg-1 over a measurement period, the average deviation of measured versus calculated values of water content was 0.009 gg-1.
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