USGS Open-File Report 2005-1413: Terrestrial Radioactivity and Gamma-ray Exposure in the United States and Canada

Data Files

The data files included on the DVD version of this publication are databases, grids, and maps that can be interactively displayed, examined, and converted to other formats using a free viewer provided by Geosoft, Inc. Table 1 lists the databases with a brief description. Table 2 lists the grids and Table 3 lists the maps. Some of the file names in the tables have links to additional information that you may find helpful. If you are interested in acquiring the DVD publication, call 1-888-ASK-USGS for information about ordering a copy.

Table 1. Listing of databases.

Database File Name	Contents
Alaska.gdb	Flightline data for surveys in Alaska
EasternUS.gdb	Flightline data for surveys in eastern USA
EastCentUS.gdb	Flightline data for surveys in east central USA
WestCentUS.gdb	Flightline data for surveys in west central USA
WesternUS.gdb	Flightline data for surveys in western USA
USandCanadaBoundaries.gdb	Political boundaries of Provinces in Canada and States in the USA

Table 2. Listing of grid files.

Grid File Name	Description
NAMrad_K.grd	Concentrations of potassium in Canada and USA
NAMrad_U.grd	Concentrations of uranium in Canada and USA
NAMrad_Th.grd	Concentrations of thorium in Canada and USA
NAMrad_exp.grd	Gamma-ray absorbed dose rate in Canada and USA

Table 3. Listing of maps.

Map File Name	Contents
NAM_K.map	Map showing concentrations of potassium in Canada and USA
NAM_U.map	Map showing concentrations of uranium in Canada and USA
NAM_Th.map	Map showing concentrations of thorium in Canada and USA
NAM_CCM.map	Composite-color map of potassium, uranium, and thorium.
NAM_exp.map	Map showing absorbed dose rate calculated from potassium, uranium, and thorium concentrations.
CosmicDose.map	Map of cosmic absorbed dose rate calculated from topography.
Topo2km.map	Map showing digital elevation model of the topography.

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