b'Geophysics in the surveysNewsGeological Survey of South Australia: Availability of 256 channel radiometrics in South AustraliaRadiometric data available from the SAin times of limited hard drive spaceWe are therefore revisiting our data Government is typically served out inon our networks was a necessity. Thepackages, and where possible, including packages containing dose rate and/orfinal supplied four channel radiometricthe original 256 channel radiometrics total count, Potassium, Uranium, anddatasets, produced by acquisition/ data. For a small number of the data Thorium channels. These four channelsprocessing contractors, do not usuallypackages (see Table 1) the raw data is are useful for a variety of geophysicalcontain the raw and NASVD 256 channelalready available (in the DATA directory), interpretation tasks, with maps ofspectra. but for newer surveys - including GCAS the channels displaying near-surfaceand Coompana - this is not the case.features that correlate with variations inGeophysical survey packages are now landforms and regolith material. Figure1hosted on Amazon Web Servers (AWS)Table 1. Surveys including 256 channel shows a preliminary 2023 image of theand so size is less of a limitation than itdata.South Australian radiometrics. has been in the past. The geophysicists at the GSSA are now receiving moreSurvey code Survey name Line kmThe four channels are (usually) createdrequests from external stakeholders via a process of noise reduction andfor raw 256 channel radiometric data1998SA008 Mt Christie 4971averaging multiple channels over a wideracquired as part of geophysical surveying1999SA041 Pine Creek 1036spectra of data, through a process called(where available), and so it makes sense2007SA034 Mullaquana/Cleve 2855NASVD (Noise Adjusted Singular Valuefor these data to be easily accessible 2009SA061 Yorke Peninsula 12231Decomposition). NASVD datasets havevia our online platform SARIG (South the benefit of being smaller in size thatAustralian Resources Information their non-NASVD counterparts, whichGateway, https://map.sarig.sa.gov.au/). There is an argument that available 256 channel radiometric datasets could be merged with released four channel radiometric datasets, as long as the data was acquired at the same time by the same acquisition contractor and aircraft. In this case, there will likely be a matching fiducial or other relatable column of data. Initial tests have revealed that this is not always the case. Null values will be created for entries where there isnt a corresponding entry, so care must be taken.This is part of an overhaul of downloadable data available from the GSSA, where we are ensuring that geophysical data are available in a variety of formats. While this will increase the size of the data packages, the 256 channel datasets are not so large that downloads become unmanageable. They are simply another dataset that can be used for advanced and further value-added geophysical interpretation.For more information, please visit SARIG (https://map.sarig.sa.gov.au/). Geophysical data can be displayed and downloaded through the All Map Layers tab, and metadata and downloads can also be found via the SARIG catalogue search option. These downloads generally do not currently include 256 channel radiometric data, with the exceptions listed in Table 1. A complete compilation of all available 256 channel data is now in progress by GSSA geophysicists.Philip Heath, Gary Reed and Tim Keeping Geological Survey of South Australia Figure 1.Preliminary 2023 RGB image of the South Australian radiometrics. Philip.Heath@sa.gov.au31 PREVIEW APRIL 2023'