Terrestrial Radioactivity and Gamma-ray Exposure in the United States and Canada: Gridded geographic images

Aerial gamma-ray surveys measure the gamma-ray flux produced by the radioactive decay of the naturally occurring elements K-40, U-238, and Th-232 in the top few centimeters of rock or soil. If the gamma-ray system is properly calibrated the data can be expressed in terms of the estimated concentrations of the radioactive elements. A ternary color-composite image was generated by commercial software Geosoft Oasismontaj to map the combination of all three elements. During the period 1975-83, the U.S. Department of Energy carried out the National Uranium Resource Evaluation (NURE) Program, which included aerial gamma-ray surveys of most of the United States. These data were reprocessed to generate this product.

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Last Updated July 26, 2019, 15:34 (CDT)
Created July 26, 2019, 15:34 (CDT)