Calculation of soil water contents from gamma ray readings

Gurr, C. G.

doi:10.1071/sr9640029

Cited by 2 publications

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“…Davidson et al [ 5] refined the technique further by a method of making rapid and frequent measurement of rapidly changing water contents in laboratory soil columns. Gurr [6] described a method for calculating water contents of undisturbed field samples of unknown initial conditions from gammaray data. The use of gamma radiation has become a fairly widespread method for nondestructive determinations of soil bulk density and water content.…”

Section: Disclaimermentioning

confidence: 99%

“…The intensity through the dry soil is related by I ds = I" ex P [(upx)p b " (u.p x )pl " <!■«*)ds^ (6) where I ds is the intensity through dry soil and M. ds , o ds , and x ds are the absorption coefficient, bulk density, and thickness, respectively, of dry soil. By dividing Equation (6) by (5) and simplifying, the bulk infrared light from entering the columns at any point other than the column surface.…”

Section: Vertical Soil Column Evaporation Experiments With Mulchesmentioning

confidence: 99%

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Gamma-Radiation Detection of Water Content in Two-Dimensional Evaporation Prevention Experiments.

Kirkham¹,

Rolston²,

Fritton³

1967

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This report waB prepared as an account of Government sponsored work. Neither the United States, nor the Commission, nor any person acting on behalf of the Commission. A. Makes any warranty or representation, expressed or Implied, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process disclosed in this report may not Infringe privately owned rights, or B. AsBumes any liabilities with respect to the UB6 of, or for damages resulting from the use of any information, apparatus, method, or procesB disclosed In this report. ' As used in the above, "person acting on behalf of the Commission" includes any employee or contractor of the Commission, or employee of such contractor, to the extent that such employee or contractor of the Commission, or employee of such contractor prepares, disseminates, or provides access to, any Information pursuant to his employment or contract I with the Commission, or his employment with such contractor.

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Section: Disclaimermentioning

confidence: 99%

Section: Vertical Soil Column Evaporation Experiments With Mulchesmentioning

confidence: 99%

Gamma-Radiation Detection of Water Content in Two-Dimensional Evaporation Prevention Experiments.

Kirkham¹,

Rolston²,

Fritton³

1967

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Gamma Radiation for Measuring Water Contents in Soil Columns With Changing Bulk Density

Olesen¹

1973

Journal of Soil Science

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Water profiles in soil columns were measured by the single-source gamma radiation method. Together with the normal attenuation equation, linear or parabolic equations for the relation between bulk density and volumetric water content were used. T o compensate for moderate changes in the bulk density during the experiment both initial and final bulk density and the water content were used in the water profile estimations.For a sandy loam soil, the radiation method without any corrections for bulk density changes resulted in a mean error of the volumetric water content estimation of 0.035 cm3 when the water content changed from 0.35 to 0.15 cm3 and3. By correction for changing bulk density by means of a linear or a parabolic equation the maximum difference between real and estimated water content was oaoog and 0*002 c m S ~m -~, respectively. Applying the latter method and a count of 106 the error of a single water content measurement was 0.004 cm3 Introduction IN studying water transport in soil columns, the water distribution and the changes in distribution are often measured by the gamma transmission method, using a single source (Gurr, 1962; Davidson

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Calculation of soil water contents from gamma ray readings

Cited by 2 publications

References 0 publications

Gamma-Radiation Detection of Water Content in Two-Dimensional Evaporation Prevention Experiments.

Gamma-Radiation Detection of Water Content in Two-Dimensional Evaporation Prevention Experiments.

Gamma Radiation for Measuring Water Contents in Soil Columns With Changing Bulk Density

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