gamma spectroscopy
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The Australian Geological Survey Organisation flew an airborne geophysical survey of 50670 line km over the entire Lissadell 1:250 000 map sheet area from May to July 1994. The survey covering the Lissadell 1:250 000 map sheet area forms part of the East Kimberley Project Area of the National Geoscience Mapping Accord. The survey was flown along east-west flight lines spaced 400 metres apart at a nominal altitude of 100 metres above ground level. The total magnetic intensity, gamma-ray spectrometric and digital elevation model data which were collected during the survey, have been processed and are available for purchase, in both digital (point located data and gridded) and map form, from the Australian Geological Survey Organisation. Colour and greyscale pixel image maps are also available.
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Magnetic, gamma-ray and gravity data sets provide vital information for mineral and petroleum explorers as well as researchers studying the geology of the Australian continent. Commonwealth and State and Territory governments have devoted considerable resources to acquiring these data sets and making them available to encourage exploration. Geoscience Australia's geophysical databases contain data acquired by governments, and this report summarises coverages over Australia of these data. On the occasion of the centenary issue of Preview, it is worth reflecting on the advances in the coverage of publicly available magnetic, gamma-ray and gravity data over Australia since the first edition of Preview in February 1986. Since then the areas and resolution of coverages have increased dramatically. Quality of the data through better acquisition and processing techniques has also improved, and new types of data sets added to the explorers' supplies.
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