Authors / CoAuthors
Poudjom Djomani, Y. | Minty, B.R.S.
Abstract
The unfiltered thorium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia which is a merge of over 600 individual gamma-ray spectrometric surveys. 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 are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2019 unfiltered thorium grid has a cell size of about 100 m (0.001 degrees) and shows thorium element concentrations of the Australia region.
Product Type
dataset
eCat Id
131988
Contact for the resource
Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Resource provider
Point of contact
Digital Object Identifier
Keywords
- ( Theme )
-
- airborne digital data
- ( Theme )
-
- radiometrics
- ( Process )
-
- thorium
- ( Theme )
-
- national geophysical compilation
- ( Discipline )
-
- Earth sciences
- ( Discipline )
-
- geophysics
- ( Data centre )
-
- NCI
- ( Place )
-
- Australia
- ( Feature type )
-
- grid
-
- Published_External
- ( Service )
-
- GADDS2.0
- ( Product )
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- radmap
- ( Feature type )
-
- raster
- ( Temporal )
-
- 2019
Publication Date
2019-11-20T02:42:23
Creation Date
2019-10-01T00:00:00
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
The unfiltered thorium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia. The radiometric grid of Australia is derived by merging over 600 airborne gamma-ray spectrometric surveys by the Commonwealth, State and Territory Governments and held in the national radioelement database of Australia. The cell sizes of the original survey grids range from 50 m through 800 m, but most have a cell size of about 100 m. The original survey grids are levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS). The grids were then re-sampled to generate the Radiometric Map of Australia Grids with a cell size of about 100m (0.001 degrees). The survey grids are levelled to each other, and to the Australia Wide Airborne Geophysical Survey (AWAGS). The AWAGS traverses were funded under the Australian Government’s Onshore Energy Security Program in 2007. They comprise N-S flight lines spaced 75 km apart and E-W tie lines spaced 400 km apart across the entire continent. The AWAGS survey was designed to serve as a baseline for both airborne gamma-ray spectrometric and magnetic surveys. Since the AWAGS traverses are consistent with the International Atomic Energy Agency’s (IAEA) radioelement datum, the new continental merges are level to this datum as well. The data quality varies depending on the survey. The data 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 final grid is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.
Parent Information
Geophysical Data Collection - radiometrics
UUID - c6b58f54-102d-19e9-e044-00144fdd4fa6,
eCat ID - 74513
Extents
[-43.7615, -9.0005, 112.7175, 153.6715]
Reference System
GDA94 (EPSG:4283)
Spatial Resolution
Service Information
Associations
Source Information
The radiometric grid of Australia is derived by merging over 550 airborne gamma-ray spectrometric surveys by the Commonwealth, State and Territory Governments and held in the national radioelement database of Australia.