Tallaringa South - Th equivalent concentration grid (AWAGS, no nasvd)

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. The Geological Survey of South Australia commissioned the Gawler Craton Airborne Survey (GCAS) as part of the PACE Copper initiative. The airborne geophysical survey was flown over parts of the Gawler Craton in South Australia. The program was designed to capture new baseline geoscientific data to provide further information on the geological context and setting of the area for mineral systems (http://energymining.sa.gov.au/minerals/geoscience/pace_copper/gawler_craton_airborne_survey). This radiometric thorium grid has a cell size of 0.0004 degrees (approximately 42m) and shows thorium element concentration of the Tallaringa South Airborne Magnetic Radiometric and DEM Survey, SA, 2017 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2017 by the SA Government, and consisted of 146285 line-kilometres of data at 200m line spacing and 60m terrain clearance. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid.

放射性测量法（radiometric method），亦称伽马射线能谱法（gamma-ray spectrometric method），可探测地表附近因钾（K）、铀（U）及钍（Th）自然放射性衰变所产生的伽马射线的自然变化。所采集的数据将通过标准化流程进行处理，以确保记录到的响应仅源于地下岩石。经处理后得到的数据集可通过解译揭示地下地质构造。经处理的数据会由澳大利亚南澳地质调查局（Geological Survey of South Australia，简称GA）的地球物理学家开展质量核验，确保该局发布的最终数据符合使用要求。澳大利亚南澳地质调查局作为PACE铜业倡议的一部分，委托开展了高勒克拉通航空测量（Gawler Craton Airborne Survey，简称GCAS）项目。此次航空地球物理勘探飞行覆盖了南澳大利亚州境内的部分高勒克拉通区域。本项目旨在获取全新的基础地球科学数据，为该区域成矿系统的地质背景与环境提供更多支撑信息，相关项目详情可通过以下链接查询：http://energymining.sa.gov.au/minerals/geoscience/pace_copper/gawler_craton_airborne_survey。本放射性钍网格数据的单元格分辨率为0.0004度（约合42米），展示的是2017年南澳州塔拉林加南部航空磁测-放射性测量及数字高程模型（Digital Elevation Model，简称DEM）调查中的钍元素浓度，单位为百万分率（parts per million，简称ppm）。用于生成该网格的数据由南澳州政府于2017年采集，总测线长度达146285千米，测线间距为200米，飞行离地高度为60米。为约束网格中的长波长信号，本次研究采用了独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey，简称AWAGS）的航空磁测数据，以校准本次勘探网格的基准值。