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Bayesian modeling of NURE airborne radiometric data for the conterminous United States: predictions and grids

Dates

Publication Date
Start Date
1973
End Date
2020

Citation

Goldman, M.A., and Ellefsen, K.J., 2020, Bayesian modeling of NURE airborne radiometric data for the conterminous United States: predictions and grids: U.S. Geological Survey data release, https://doi.org/10.5066/P9YEAFHI.

Summary

This data release includes estimates of potassium (K), equivalent uranium (eU), and equivalent thorium (eTh) for the conterminous United States derived from the U.S. Geological Survey's national airborne radiometric data compilation (Duval and others, 2005). Airborne gamma ray spectrometry (AGRS) measures the gamma-rays that are emitted from naturally occurring radioactive isotopes found in rocks and soil, the most abundant of which are potassium (K40), uranium (U238), and thorium (Th232). Radiometric data can aid in exploration of critical mineral resources, including deposits of barium, fluorine, titanium, beryllium, niobium, rare-earth elements, and uranium. There is also growing interest in using radiometric data to map soil properties. [...]

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Attached Files

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Predictions_eTh_EastCentUS.csv 109.74 MB
Predictions_eTh_EasternUS.csv 109.58 MB
Predictions_eTh_WestCentUS.csv 106.39 MB
Predictions_eTh_WesternUS.csv 112.59 MB
Predictions_eU_EastCentUS.csv 109.68 MB
Predictions_eU_EasternUS.csv 109.45 MB
Predictions_eU_WestCentUS.csv 106.01 MB
Predictions_eU_WesternUS.csv 112.24 MB
Predictions_K_EastCentUS.csv 109.43 MB
Predictions_K_EasternUS.csv 109.29 MB
Predictions_K_WestCentUS.csv 105.98 MB
Predictions_K_WesternUS.csv 112.11 MB
Predictions_eTh_EastCentUS.zip 37.23 MB
Predictions_eTh_EasternUS.zip 37.43 MB
Predictions_eTh_WestCentUS.zip 35.51 MB
Predictions_eTh_WesternUS.zip 37.69 MB
Predictions_eU_EastCentUS.zip 37.12 MB
Predictions_eU_EasternUS.zip 37.26 MB
Predictions_eU_WestCentUS.zip 35.44 MB
Predictions_eU_WesternUS.zip 37.57 MB
Predictions_K_EastCentUS.zip 37.23 MB
Predictions_K_EasternUS.zip 37.43 MB
Predictions_K_WestCentUS.zip 35.23 MB
Predictions_K_WesternUS.zip 37.37 MB
rad_BMNUS_DataDictionary.csv 33.79 KB
composite.zip 23.35 MB
composite.jpg thumbnail 580.98 KB
Extension: K_Y_sd.zip
K_Y_sd.sld 1.91 KB
K_Y_sd.tfw 98 Bytes
K_Y_sd.tif 14.26 MB
Extension: K_prob.zip
K_prob.sld 1.71 KB
K_prob.tfw 98 Bytes
K_prob.tif 14.26 MB
Extension: K_Y_mean_per.zip
K_Y_mean_per.sld 1.9 KB
K_Y_mean_per.tfw 98 Bytes
K_Y_mean_per.tif 14.26 MB
Extension: K_Y_mean.zip
K_Y_mean.sld 1.91 KB
K_Y_mean.tfw 98 Bytes
K_Y_mean.tif 14.26 MB
Extension: eU_Y_sd.zip
eU_Y_sd.sld 1.9 KB
eU_Y_sd.tfw 98 Bytes
eU_Y_sd.tif 14.26 MB
Extension: eU_prob.zip
eU_prob.sld 1.91 KB
eU_prob.tfw 98 Bytes
eU_prob.tif 14.26 MB
Extension: eU_Y_mean_ppm.zip
eU_Y_mean_ppm.sld 1.89 KB
eU_Y_mean_ppm.tfw 98 Bytes
eU_Y_mean_ppm.tif 14.26 MB
Extension: eU_Y_mean.zip
eU_Y_mean.sld 1.91 KB
eU_Y_mean.tfw 98 Bytes
eU_Y_mean.tif 14.26 MB
Extension: eTh_Y_sd.zip
eTh_Y_sd.sld 1.91 KB
eTh_Y_sd.tfw 98 Bytes
eTh_Y_sd.tif 14.26 MB
Extension: eTh_prob.zip
eTh_prob.sld 1.87 KB
eTh_prob.tfw 98 Bytes
eTh_prob.tif 14.26 MB
Extension: eTh_Y_mean_ppm.zip
eTh_Y_mean_ppm.sld 1.9 KB
eTh_Y_mean_ppm.tfw 98 Bytes
eTh_Y_mean_ppm.tif 14.26 MB
Extension: eTh_Y_mean.zip
eTh_Y_mean.sld 2.48 KB
eTh_Y_mean.tfw 98 Bytes
eTh_Y_mean.tif 14.26 MB

Purpose

The National Uranium Resource Evaluation (NURE) airborne program was established in 1973 to collect radiometric data for the conterminous United States and Alaska for the purpose of identifying uranium resources in the United States (Hill and others, 2009). Surveys were flown at a nominal terrain clearance of 120 meters. Each airborne data point samples an area of several thousand square meters to a depth of about 30 centimeters (Duval and others, 1971). Surveys were flown with 10-kilometer spacing over most of the eastern conterminous United States, and 5-kilometer spacing over most of the western conterminous United States. The data were collected to provide a regional picture of natural radioactivity across parts of North America (Duval and others, 2005). The flightline data for the United States were previously processed by Duval (2001), Duval (2000), and Duval and Riggle (1999) and later compiled into five separate databases (eastern U.S., east-central U.S., west-central U.S., western U.S., and Alaska) (Duval and others, 2005). The databases compiled by Duval and others (2005) were added to the original report in 2009, and are available at https://pubs.usgs.gov/of/2005/1413/. This data release presents new gridded products created by the application of Bayesian statistical techniques to the national compilation of airborne radiometric data for the conterminous United States. The statistical methods are available as an R package (Ellefsen and others, 2020) and described by Ellefsen and Van Gosen (2020). The purpose of creating the grids was to demonstrate the application of these new methods to airborne radiometric data, providing not only maps of predicted values of equivalent thorium, equivalent uranium, and potassium, but also estimates of uncertainty associated with those predictions. Additional objectives were to create grids that were scaled appropriately to the data, document checks of model fit, and provide gridding methods that can be implemented in open-source software.

Additional Information

Identifiers

Type Scheme Key
DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/P9YEAFHI

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