Authors / CoAuthors
Geophysical Acquisition & Processing Section
Abstract
This GSQ Anakie Qld thorium grid geodetic is an airborne-derived radiometric thorium window countrate grid for the Anakie Qld, 1990 survey. 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 thorium (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 GSQ Anakie Qld thorium grid geodetic has a cell size of 0.00096 degrees (approximately 102m). The data are in units of counts per second (or cps). The data used to produce this grid was acquired in 1990 by the QLD Government, and consisted of 15068 line-kilometres of data at 400m line spacing and 60m terrain clearance.
Product Type
dataset
eCat Id
141851
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 )
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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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- QLD
- ( Project )
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- survey 794
- ( 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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- window countrate
- ( 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 GSQ Anakie Qld thorium grid geodetic is an airborne-derived radiometric thorium window countrate grid for the Anakie Qld, 1990 survey. The survey was acquired in 1990 under the project No. 794 for the geological survey of QLD. The data consisted of 15068 line-kilometres of data at 400m line spacing and 60m terrain clearance. The radiometric count rate is contaminated by background radiation contributions from the aircraft, cosmic rays, and the presence of Radon gas escaping from the ground. It is also affected by the ground clearance of the detector, as well as the volume of the detector. This grid was produced after applying radiometric corrections to the thorium window data from the survey. The final grid is checked for quality by GA geophysicists to ensure that the final data released are fit-for-purpose. This GSQ Anakie Qld thorium grid geodetic has a cell size of 0.00096 degrees (approximately 102m) and shows the thorium window countrate of the Anakie Qld, 1990 survey in units of counts per second (or cps). 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. References 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
[-23.6948, -22.5889, 147.2302, 148.0049]
Reference System
AGD66 (EPSG:4202)
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
This GSQ Anakie Qld thorium grid geodetic includes airborne-derived radiometric Thorium window count radiometric data for the Anakie Qld, 1990 survey acquired for the geological survey of QLD