Canada - Radiometric survey data compilation

Canada - Radiometric survey data compilation The data presented in the radioactivity map of Canada series (Buckle et al., 2014) depict the surface concentrations of three naturally-occurring radioactive elements: potassium (K, %), equivalent uranium (eU, ppm), and equivalent thorium (eTh, ppm); as well as five derived products: natural air absorbed dose rate (NADR, nGy/h) calculated from a linear combination of potassium, equivalent uranium, and equivalent thorium concetrations; the ratios eU/eTh, eU/K, and eTh/K; and the ternary map which uses false colour to illustrate the co-variation of the three measured elements (Broome et al., 1987). This compilation was produced with data from more than 370 airborne gamma-ray surveys flown or supervised by the Geological Survey of Canada between 1969 and 2011. Data was calibrated and acquired in accordance to standards in effect at the time each survey (see Darnley et al., 1975 and IAEA, 1991). Most of the data was acquired using 50 L of Sodium Iodide (NaI) detectors flown at a nominal terrain clearance of 120 m, but line spacings vary from 5000 m to 200 m depending on the specific survey. Potassium is measured directly from the 1460 keV gamma-ray photons emitted by Potassium-40. Uranium and thorium, however, are determined indirectly from gamma-ray photons emitted by daughter products Bismuth-214 (1765 keV) and Thallium-208 (2614 keV) respectively assuming equilibrium between daughter and parent isotopes. For this reason, gamma-ray spectrometric measurements of uranium and thorium are referred to as equivalent uranium (eU) and equivalent thorium (eTh). The measured gamma-rays originate from geological materials in the upper 30 cm of the Earth's surface and their intensity are directly related to the concentrations of K, U and Th in the rocks and minerals present. The geochemical information presented in this compilation is used to support bedrock and surficial geology mapping by outlining lithological variations. It can also indicate mineralization either by association of radio-elements as trace elements with economic minerals or through delineation of their enrichment or depletion due to geochemical alteration resulting from mineralization processes. Overall, this information also contributes to the characterization of the natural radiation environment. Futher information on data acquisition, processing and interpretation and on application can be found in IAEA-TECDOC-1363 (2003), and references therein. These data were also published as Geological Survey of Canada maps, in the Open Files series (7396-7403). References Broome, J., J.M. Carson, J.A. Grant, and K.L. Ford, 1987. A modified ternary radioelement mapping technique and its application to the south coast of Newfoundland, Geological Survey of Canada, Paper 87-14. https://doi.org/10.4095/122382 Buckle, J.L., J.M. Carson, K.L. Ford, R. Fortin and W.F. Miles, 2014, Radioactivity map of Canada, ternary radioelement map, Geological Survey of Canada, Open File 7397. https://doi.org/10.4095/293354 Darnley, A.G., E. M. Cameron and K. A. Richardson, 1975. The Federal-Provincial Uranium Reconnaissance Program, in Geological Survey of Canada, Paper 75-26, p. 49-71. https://doi.org/10.4095/102591 International Atomic Energy Agency, 1991. Airborne Gamma Ray Spectrometer Surveying, International Atomic Energy Agency, Technical Reports Series No. 323. https://www.iaea.org/publications/1427/airborne-gamma-ray-spectrometer-surveying International Atomic Energy Agency, 2003. Guidelines for radioelement mapping using gamma ray spectrometry data; International Atomic Energy Agency, Technical Reports Series No. 1363. https://www.iaea.org/publications/6746/guidelines-for-radioelement-mapping-using-gamma-ray-spectrometry-data 2020-05-05 Natural Resources Canada nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca Form DescriptorsNature and EnvironmentScience and TechnologyGeophysics; generalGeophysicsRadioactivityEarth sciences Equivalent Uranium - Potassium radioactivity, Canada (250 m grid) - EnglishZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-eng.php?dapid=137 Equivalent Uranium - Potassium radioactivity, Canada (250 m grid) - FrenchZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-fra.php?dapid=137 Equivalent Uranium - equivalent Thorium radioactivity, Canada (250 m grid) - FrenchZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-fra.php?dapid=135 Equivalent Uranium - equivalent Thorium radioactivity, Canada (250 m grid) - EnglishZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-eng.php?dapid=135 Equivalent Thorium radioactivity, Canada (250 m grid) - FrenchZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-fra.php?dapid=133 Equivalent Thorium radioactivity, Canada (250 m grid) - EnglishZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-eng.php?dapid=133 Radioactivité due à l'équivalent Thorium et au Potassium, Canada (grille 250 m) - EnglishZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-eng.php?dapid=134 Radioactivité due à l'équivalent Thorium et au Potassium, Canada (grille 250 m) - FrenchZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-fra.php?dapid=134 Radioactivity map of Canada, potassium (Open File 7403) - EnglishPDF https://doi.org/10.4095/293360 Radioactivity map of Canada, potassium (Open File 7403) - FrenchPDF https://doi.org/10.4095/293360 Radioactivity map of Canada, natural air absorbed dose rate (Open File 7396) - FrenchPDF https://doi.org/10.4095/293353 Radioactivity map of Canada, natural air absorbed dose rate (Open File 7396) - EnglishPDF https://doi.org/10.4095/293353 Radioactivity map of Canada, ternary radioelement map (Open File 7397) - EnglishPDF https://doi.org/10.4095/293354 Radioactivity map of Canada, ternary radioelement map (Open File 7397) - FrenchPDF https://doi.org/10.4095/293354 Radioactivity map of Canada, thorium (Open File 7401) - FrenchPDF https://doi.org/10.4095/293358 Radioactivity map of Canada, thorium (Open File 7401) - EnglishPDF https://doi.org/10.4095/293358 Radioactivity map of Canada, thorium/potassium (Open File 7398) - EnglishPDF https://doi.org/10.4095/293355 Radioactivity map of Canada, thorium/potassium (Open File 7398) - FrenchPDF https://doi.org/10.4095/293355 Radioactivity map of Canada, uranium (Open File 7402) - EnglishPDF https://doi.org/10.4095/293359 Radioactivity map of Canada, uranium (Open File 7402) - FrenchPDF https://doi.org/10.4095/293359 Radioactivity map of Canada, uranium/potassium (Open File 7399) - EnglishPDF https://doi.org/10.4095/293356 Radioactivity map of Canada, uranium/potassium (Open File 7399) - FrenchPDF https://doi.org/10.4095/293356 Radioactivity map of Canada, uranium/thorium (Open File 7400) - EnglishPDF https://doi.org/10.4095/293357 Radioactivity map of Canada, uranium/thorium (Open File 7400) - FrenchPDF https://doi.org/10.4095/293357 Equivalent Uranium radioactivity, Canada (250 m grid) - EnglishZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-eng.php?dapid=141 Equivalent Uranium radioactivity, Canada (250 m grid) - FrenchZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-fra.php?dapid=141 Natural Air Absorbed Radioactivity Dose Rate, Canada (250 m grid) - EnglishZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-eng.php?dapid=136 Natural Air Absorbed Radioactivity Dose Rate, Canada (250 m grid) - FrenchZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-fra.php?dapid=136 Potassium radioactivity, Canada (250 m grid) - FrenchZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-fra.php?dapid=132 Potassium radioactivity, Canada (250 m grid) - EnglishZIP http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-eng.php?dapid=132 Web map service - EnglishWMS http://wms.agg.nrcan.gc.ca/wms2/wms2.aspx?service=wms&version=1.3.0&request=GetCapabilities&layers=132,133,134,135,136,137,141 Web map service - FrenchWMS http://wms.agg.nrcan.gc.ca/wms2/wms2.aspx?service=wms&version=1.3.0&request=GetCapabilities&layers=132,133,134,135,136,137,141

The data presented in the radioactivity map of Canada series (Buckle et al., 2014) depict the surface concentrations of three naturally-occurring radioactive elements: potassium (K, %), equivalent uranium (eU, ppm), and equivalent thorium (eTh, ppm); as well as five derived products: natural air absorbed dose rate (NADR, nGy/h) calculated from a linear combination of potassium, equivalent uranium, and equivalent thorium concetrations; the ratios eU/eTh, eU/K, and eTh/K; and the ternary map which uses false colour to illustrate the co-variation of the three measured elements (Broome et al., 1987). This compilation was produced with data from more than 370 airborne gamma-ray surveys flown or supervised by the Geological Survey of Canada between 1969 and 2011. Data was calibrated and acquired in accordance to standards in effect at the time each survey (see Darnley et al., 1975 and IAEA, 1991). Most of the data was acquired using 50 L of Sodium Iodide (NaI) detectors flown at a nominal terrain clearance of 120 m, but line spacings vary from 5000 m to 200 m depending on the specific survey. Potassium is measured directly from the 1460 keV gamma-ray photons emitted by Potassium-40. Uranium and thorium, however, are determined indirectly from gamma-ray photons emitted by daughter products Bismuth-214 (1765 keV) and Thallium-208 (2614 keV) respectively assuming equilibrium between daughter and parent isotopes. For this reason, gamma-ray spectrometric measurements of uranium and thorium are referred to as equivalent uranium (eU) and equivalent thorium (eTh). The measured gamma-rays originate from geological materials in the upper 30 cm of the Earth's surface and their intensity are directly related to the concentrations of K, U and Th in the rocks and minerals present. The geochemical information presented in this compilation is used to support bedrock and surficial geology mapping by outlining lithological variations. It can also indicate mineralization either by association of radio-elements as trace elements with economic minerals or through delineation of their enrichment or depletion due to geochemical alteration resulting from mineralization processes. Overall, this information also contributes to the characterization of the natural radiation environment. Futher information on data acquisition, processing and interpretation and on application can be found in IAEA-TECDOC-1363 (2003), and references therein. These data were also published as Geological Survey of Canada maps, in the Open Files series (7396-7403). References Broome, J., J.M. Carson, J.A. Grant, and K.L. Ford, 1987. A modified ternary radioelement mapping technique and its application to the south coast of Newfoundland, Geological Survey of Canada, Paper 87-14. https://doi.org/10.4095/122382 Buckle, J.L., J.M. Carson, K.L. Ford, R. Fortin and W.F. Miles, 2014, Radioactivity map of Canada, ternary radioelement map, Geological Survey of Canada, Open File 7397. https://doi.org/10.4095/293354 Darnley, A.G., E. M. Cameron and K. A. Richardson, 1975. The Federal-Provincial Uranium Reconnaissance Program, in Geological Survey of Canada, Paper 75-26, p. 49-71. https://doi.org/10.4095/102591 International Atomic Energy Agency, 1991. Airborne Gamma Ray Spectrometer Surveying, International Atomic Energy Agency, Technical Reports Series No. 323. https://www.iaea.org/publications/1427/airborne-gamma-ray-spectrometer-surveying International Atomic Energy Agency, 2003. Guidelines for radioelement mapping using gamma ray spectrometry data; International Atomic Energy Agency, Technical Reports Series No. 1363. https://www.iaea.org/publications/6746/guidelines-for-radioelement-mapping-using-gamma-ray-spectrometry-data

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