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Spencer - Th equivalent concentration grid (AWAGS, nasvd)

Created 16/10/2025

Updated 16/10/2025

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The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This radiometric thorium grid has a cell size of 0.0004 degrees (approximately 41m) and shows thorium element concentration of the Spencer Airborne Magnetic Radiometric and DEM survey, SA, 2018 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2018 by the SA Government, and consisted of 49937 line-kilometres of data at 200m line spacing and 60m terrain clearance. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid.

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Additional Info

Field Value
Title Spencer - Th equivalent concentration grid (AWAGS, nasvd)
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/d38aded9-c7b3-4c8d-a61b-e6d0a045723e
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 11/06/2018 - 11/06/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        136.491,
        -32.6702
      ],
      [
        137.913,
        -32.6702
      ],
      [
        137.913,
        -31.9954
      ],
      [
        136.491,
        -31.9954
      ],
      [
        136.491,
        -32.6702
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Spencer - Th equivalent concentration grid (AWAGS, nasvd)". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/spencer-th-equivalent-concentration-grid-awags-nasvd