Aeroradiometric grids for North America

Gridded data generated by aerial sensing of radiation emanating from the earth's surface provides general estimates of the geographic distribution of Uranium, Thorium, and Potassium in surficial and bedrock units. Covers the conterminous United States, southeastern Canada, and most of Alaska, but there are gaps in northern Québec, western Canada, and north central Alaska

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Show in a web browser window:

reduced-size image of the interactive map

Uranium

Thorium

Potassium

Composite

Show in Google Earth or other KML viewer:

radiometric.kmz (Includes U, Th, K, and absorbed dose 1k byte)

Show in your GIS using OGC web services:

Service, version	URL	Capabilities document
WMS, version 1.3.0	https://mrdata.usgs.gov/services/aerorad	Capabilities

Download

TIFF image	size	TFW	Thumbnail	Geosoft Grid	ArcGIS Grid
Color composite	40M	tfw	PNG, 111kb	(unavailable)	(unavailable)
Potassium	41M	tfw	PNG, 66kb	NAMrad_K.grd NAMrad_K.grd.gi	NAMrad_K.zip
Thorium	42M	tfw	PNG, 66kb	NAMrad_Th.grd NAMrad_Th.grd.gi	NAMrad_Th.zip
Uranium	41M	tfw	PNG, 66kb	NAMrad_U.grd NAMrad_U.grd.gi	NAMrad_U.zip
Absorbed dose	41M	tfw	PNG, 66kb	NAMrad_exp.grd NAMrad_exp.grd.gi	NAMrad_exp.zip

Additional downloadable data files are available from the original publication

Documentation

Metadata:

Outline - Questions & Answers - Plain text - XML

Publication

Terrestrial Radioactivity and Gamma-ray Exposure in the United States and Canada

Duval, Joseph S., Carson, John M., Holman, Peter B., and Darnley, Arthur G., 2005, Terrestrial Radioactivity and Gamma-ray Exposure in the United States and Canada: U.S. Geological Survey Open-File Report 2005-1413, https://doi.org/10.3133/ofr20051413.

The national compilation, including United States, southeastern Canada, and most of Alaska, with gaps in northern Québec, western Canada, and north central Alaska

Aeromagnetic and aeroradiometric data for the conterminous United States and Alaska from the National Uranium Resource Evaluation (NURE) program of the U.S. Department of Energy

Hill, Patricia L., Kucks, Robert P., and Ravat, Dhananjay, 2009,Aeromagnetic and aeroradiometric data for the conterminous United States and Alaska from the National Uranium Resource Evaluation (NURE) program of the U.S. Department of Energy: U.S. Geological Survey Open-File Report 2009-1129, https://doi.org/10.3133/ofr20091129

Flight-line data from the original surveys available for each 1°x2° map quadrangle, used in creating the national compilation