Brief description
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 0.00039074 degrees (approximately 40m) and shows thorium element concentration of the Cobar Magnetic and Radiometric Survey, 2021 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2021 by the NSW Government, and consisted of 53617 line-kilometres of data at 200m line spacing and 60m terrain clearance.
Lineage
Maintenance and Update Frequency: notPlanned
Statement: This Cobar P5009 EXT 1 Thorium ground concentration grid is an airborne-derived radiometric thorium grid for the Cobar Magnetic and Radiometric Survey, 2021. The survey was acquired under the project No. 5009 for the geological survey of NSW. The grid has a cell size of 0.00039074 degrees (approximately 40m). A total of 53617 line-kilometres of data at a line spacing of 200m and 60m terrain clearance were acquired to produce this grid. This radiometric thorium grid shows thorium element concentration of the Cobar Magnetic and Radiometric Survey, 2021 in units of parts per million (or ppm). Noise-adjusted singular value decomposition (NASVD) has been applied to the data. NASVD is a spectral component analysis procedure for the removal of noise from gamma-ray spectra. Details of the specifications of individual airborne surveys can be found in the Fourteenth Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). This Index is also available online at http://pid.geoscience.gov.au/dataset/79134.
Reference:
Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).
Reference:
Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).
Notes
PurposeThis data set forms part of the NSW and national airborne magnetic and radiometric mosaic that is continually updated with higher resolution datasets. When integrated with other geological, geochemical, geophysical or technical datasets, it provides pre-competitive insight into the mineral, groundwater, energy, soil and other resource potential of the continental land mass. Subject to the quality control, equipment tolerances and inherent limitations on the measurements themselves, it may also be employed for other geophysical and scientific investigations into the earth.
Created: 21 06 2022
Issued: 12 07 2022
Data time period: 08 06 2021 to 10 08 2021
text: westlimit=145.1; southlimit=-33.1; eastlimit=147.1; northlimit=-31.1; projection=GDA94 (EPSG:4283)
Subjects
Australia |
EARTH SCIENCES |
Earth sciences |
GADDS2.0 |
NASVD |
NCI |
NSW |
Published_External |
Th |
airborne digital data |
gamma-ray |
geophysical survey |
geophysics |
geoscientificInformation |
grid |
rad |
radiometrics |
raster |
spectrometry |
survey 5009 |
thorium |
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Other Information
The Geophysical Archive Data Delivery System (GADDS2) portal provides HTTP download of geophysics datasets in a number of formats. Point and line datasets are available in NetCDF and ASEG-GDF2. Grid datasets are available in NetCDF, GeoTIFF and ERS. (File available for download in various formats from the GADDS2 portal)
Identifiers
- global : ae04b8bc-7caf-473e-ae5d-597542f27700
