Penetration Resistance of Soils. Report 2. Gamma-Ray Techniques for Nondestructive Measurements of Soil Density and Density Profile

摘要

A study was conducted to determine the feasibility of using measurements made with a multichannel gamma-ray spectrometer and a cobalt 60 radiation source for accurately determining soil density and resolving the density profile of layers. Measurements were first made on aluminum and steel plates to establish a standard reference for comparing soil density. Two samples of air-dry sand were constructed at different densities to a depth of approximately 120 and 125 cm in a pit 51.82 m long and 3.54 m wide. Measurements were made at depth intervals of 12.7 cm in each of six access holes located in the samples. The densities determined were compared with densities determined by nonnuclear means. (Author)