Authors / CoAuthors
Abstract
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.
Product Type
dataset
eCat Id
146856
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
Resource provider
Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
- ( Data centre )
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- NCI
- ( Discipline )
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- Earth sciences
- ( Discipline )
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- geophysics
- ( Feature type )
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- grid
- ( Place )
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- Australia
- ( Place )
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- NSW
- ( Project )
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- survey 5009
- ( Theme )
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- GADDS2.0
- ( Theme )
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- radiometrics
- ( Theme )
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- NASVD
- ( Theme )
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- thorium
- ( Theme )
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- airborne digital data
- ( Theme )
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- geophysical survey
- ( Theme )
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- rad
- ( Theme )
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- Th
- ( Theme )
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- gamma-ray
- ( Theme )
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- spectrometry
- ( Theme )
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- grid
- ( Theme )
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- raster
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- Published_External
Publication Date
2022-07-12T01:09:20
Creation Date
2022-06-21T00:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
This 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.
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
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).
Parent Information
Geophysical Data Collection - Airborne Geophysics
UUID - ddeb0fc4-32e3-4913-80f2-f4249b17a925,
eCat ID - 111301
Extents
[-33.1, -31.1, 145.1, 147.1]
Reference System
GDA94 (EPSG:4283)
Spatial Resolution
Service Information
Associations
Association Type - operatedOnBy
Cobar P5009 EXT 1 Thorium ground concentration grid NCSS
Association Type - operatedOnBy
Cobar P5009 EXT 1 Thorium ground concentration grid OPeNDAP
Association Type - operatedOnBy
Cobar P5009 EXT 1 Thorium ground concentration grid WMS
Association Type - operatedOnBy
Downloads and Links
File available for download in various formats from the GADDS2 portal
Cobar P5009 EXT 1 Thorium ground concentration grid file download
Cobar P5009 EXT 1 Thorium ground concentration grid NCSS
Cobar P5009 EXT 1 Thorium ground concentration grid OPeNDAP
Source Information
This Cobar P5009 EXT 1 Thorium ground concentration grid includes airborne-derived radiometric thorium data for the Cobar Magnetic and Radiometric Survey, 2021 acquired for the geological survey of NSW