Tallaringa South - U 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 uranium grid has a cell size of 0.0004 degrees (approximately 42m) and shows uranium 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），又称伽马能谱法（gamma-ray spectrometric method），通过采集地表附近的伽马射线自然变化数据，以反映钾（K）、铀（U）与钍（Th）的自然放射性衰变所产生的辐射信号。所采集的数据将通过标准化流程进行处理，确保记录的响应仅源自地下岩石的辐射。经处理后得到的数据集可用于解译，以揭示地下地质构造。经处理的数据将由南澳地质调查局（Geological Survey of South Australia, 简称GA）的地球物理学家开展质量核验，以确保该局发布的最终数据满足使用要求。南澳地质调查局牵头开展了高勒克拉通航空测量项目（Gawler Craton Airborne Survey, 简称GCAS），该项目是PACE铜矿倡议的组成部分。此次航空地球物理测量作业覆盖了南澳境内高勒克拉通的部分区域。本项目旨在获取全新的基准地球科学数据，以进一步阐明该区域的地质背景与成矿系统相关环境，相关详情可参阅：http://energymining.sa.gov.au/minerals/geoscience/pace_copper/gawler_craton_airborne_survey。本次发布的放射性铀元素栅格数据的单元格大小为0.0004度（约合42米），展示了2017年南澳塔灵加南部航空磁测放射性测量与数字高程模型（DEM）调查项目中的铀元素浓度，单位为百万分率（parts per million, 简称ppm）。本栅格数据所用的原始数据由南澳政府于2017年采集完成，总测线长度达146285线公里，测线间距为200米，飞行离地高度为60米。为抑制栅格数据中的长波长噪声，本次处理采用了独立数据集——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，以校准该测量栅格的基准水平。