1. Improved laboratory calibration of a single-probe surface gamma-neutron gauge
- Author
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Cassaro, F. A. M., Tominaga, T. T., Bacchi, O. O. S., Reichardt, K., Oliveira, J. C. M., and Timm, L. C.
- Subjects
Calibration -- Equipment and supplies -- Analysis ,Soil research -- Equipment and supplies -- Analysis ,Gamma rays -- Usage -- Equipment and supplies -- Analysis ,Gages -- Equipment and supplies -- Usage -- Analysis ,Agricultural industry ,Earth sciences ,Usage ,Analysis ,Equipment and supplies - Abstract
Surface gamma-neutron gauges are extensively used for the determination of soil physical properties such as density. Substantial differences are sometimes observed between density values provided by these gauges when using factory-supplied calibrations and gravimetric density measurements. These differences can be as high as 16%. In this paper it is shown that, using homogeneous materials with different known densities covering a wider range, it is possible to find a better calibration equation. This calibration provides density values in agreement with gravimetric measurements. Additional keywords: gamma-ray attenuation, backscatter, soil bulk density., Introduction Measurements of bulk density and water content are widely used to characterise soil physical conditions so that the behavior of agronomic systems can be better understood. Among several available [...]
- Published
- 2000