Th∕K and Th∕U Ratios from Spectral Gamma-Ray Surveys Improve the Mapped Definition of Subsurface Structures

• DOI: 10.2113/jeeg11.1.53
• Publication Date: 2006-11-16T20:34:14Z
• Authors: A. Ruffell; J. M. McKinley; C. D. Lloyd; C. Graham
• Keywords: 550; Earth and Planetary Sciences(all); name=General Earth and Planetary Sciences; 01 natural sciences; /dk/atira/pure/subjectarea/asjc/2300; Environmental Science(all); /dk/atira/pure/subjectarea/asjc/2200; /dk/atira/pure/subjectarea/asjc/1900/1900; name=General Engineering; name=General Environmental Science; /dk/atira/pure/subjectarea/asjc/2200/2200; Engineering(all); /dk/atira/pure/subjectarea/asjc/2300/2300; /dk/atira/pure/subjectarea/asjc/1900; 0105 earth and related environmental sciences

Spectral gamma-ray data can be obtained by non-destructive, automated, rapid and inexpensive survey methods. Previous studies utilise only total count, or count as well K, U Th data. This work examines the use of [Formula: see text] ratios to define subsurface extent partially-buried features at centimeter meter scale. On-site results are presented from two case two-dimensional cross-sections. Changes in coincide with known location buried structures within horizontal resolution. Gradual changes measurements give a lower accuracy text]. Grids were manipulated ArcGIS™ using thin plate spline function maximise information provide ‘easy interpret’ maps areas. Unlike individual element maps, ratio compared structures, vindicating cross-sections archaeological, geotechnical forensic applications. It is concluded that capacity observe sub-surface enhanced through ratios.