Authors / CoAuthors
Geophysical Acquisition & Processing Section
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 0.00083 degrees (approximately 91m) and shows thorium element concentration of the Dunmarra, NT, 2014 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2014 by the NT Government, and consisted of 104017 line-kilometres of data at 400m line spacing and 80m terrain clearance.
Product Type
dataset
eCat Id
143578
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
- ( Data centre )
-
- 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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- NT
- ( Project )
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- survey 1268
- ( 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
2020-03-07T00:00:00
Creation Date
2020-03-07T00:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
This NT P1268 Dunmarra Thorium Grid Geodetic is an airborne-derived radiometric thorium grid for the Dunmarra, NT, 2014. The survey was acquired under the project No. 1268 for the geological survey of NT. The grid has a cell size of 0.00083 degrees (approximately 91m). A total of 104017 line-kilometres of data at a line spacing of 400m and 80m terrain clearance were acquired to produce this grid. This radiometric thorium grid shows thorium element concentration of the Dunmarra, NT, 2014 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
[-18.0265, -14.4729, 131.9785, 134.0227]
Reference System
GDA94 (EPSG:4283)
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
This NT P1268 Dunmarra Thorium Grid Geodetic includes airborne-derived radiometric thorium data for the Dunmarra, NT, 2014 acquired for the geological survey of NT