IN SITU DETERMINATION OF THE SLOPE OF THE CALIBRATION CURVE OF A NEUTRON PROBE USING A VOLUMETRIC TECHNIQUE

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Abstract
This paper presents a volumetric technique that provides an in situ estimate of the slope of the calibration curve of a neutron probe. The calculated slopes agreed well with slopes that were obtained by field calibration using gravimetric techniques or by calibration using soil packed in barrels. The latter technique showed the importance of packing the soil to field density, as density strongly affected the intercept of the calibration curve due to the content of moderators, including constitutional hydrogen in the red-yellow podzolic soil. The major advantage of the proposed technique is the direct determination of the slope of the calibration curve and, consequently, the ability to permit accurate estimates of changes in water content.

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