- GeoRef, Copyright 2008, American Geological Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
The X-radiographs obtained by this method are invaluable in determining the proper cutting orientation and sampling scheme to be used on the core. The technique utilizes an aluminum filter which, placed lengthwise over the cylindrical plastic liner of the core, effectively compensates for the difference in sediment thickness through which the X-rays penetrate. As a result of this compensation, radiographs show no change in resolution or contrast from the center to the edges of the core. This quick, easy, and inexpensive method provides a complete picture log of the core. The technique allows rotation of the core around its longitudinal axis to any desired orientation so that one can accurately record the locations and dimensions of specific particles, laminae, or structural features.