For each airborne gamma-ray spectrometry survey, both analogue products and digital data are released in a variety of point/line & grid/image formats.

Analogue products include:
(Note : ^* acronyms commonly used in filenames for these products.)

• maps of 7 primary radiometric elements:
  • POT^* - Potassium (K, %)
  • URA^* - equivalent Uranium (eU, ppm)
  • THO^* - equivalent Thorium (eTh, ppm)
  • ADRN^* - Natural air absorbed dose rate (ADRN, nGy/h)
  • RUT^* - equivalent Uranium/equivalent Thorium (eU/eTh)
  • RUK^* - equivalent Uranium/Potassium (eU/K, ppm/%)
  • RTK^* - equivalent Thorium/Potassium (eTh/K, ppm/%)
  
  
• TER^* ternary radioelement map (K, U, Th)

• maps of secondary products:
  • MTF^* - magnetic total field (nT)
  • MVG^* - magnetic vertical gradient (computed, nT/m)
  • VTF^* - VLF total field (%)
  • VQU^* - VLF quadrature (%)
  
  
• booklets for a single map sheet, comprising:
  • maps of primary & secondary variables (as above)
  • simplified topographic overlay
  • simplified geology overlay
  • stacked profile sections for all measured variables

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Digital products include:

• grids (K, eU, eTh, Exposure, eU/K, eTh/K, eU/eTh)
  These are binary floating-point flat raster files.
• ternary (K, eU, eTh) image
  This is a binary 8-bit 3-band BIL (Band Interleaved by Line) image file that has been created from the original K, eU & eTh files using an algorithm tailored to the unique character of radiometric data (Broome et al, 1987).
• multivariable point (flight line) data - all measured variables
  This is a binary file in the proprietary Survey Line Data (SLD) format. It is designed for viewing with the SurView software (provided free with the data).

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The following Open File special products are also available:

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NATGAM airborne gamma-ray spectrometry data.

For each airborne gamma-ray spectrometry survey, the Section releases both analogue and digital products, in a variety of point/line & grid/image formats. Each survey is assigned a GSC Open File number that is listed in the GSC Monthly Information Circular along with a short description.

The prices and ordering information for the digital and analogue products of each Open File release are listed in the GSC Information Circulars. For custom orders or to enquire about the availability of data for a specific area, please contact:

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Digital data purchased from the Radiation Geophysics Section is accompanied by the following Licence Agreement: