Tallaringa North - Th equivalent concentration grid (AWAGS, 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.This radiometric thorium grid has a cell size of 0.00042 degrees (approximately 44m) and shows thorium element concentration of the Tallaringa North 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 98230 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）自然放射性衰变产生的伽马射线的自然变化。所采集的数据将采用标准方法进行处理，以确保记录到的地球物理响应仅源于地下岩石。经处理得到的数据集可通过解译揭示地下地质构造。经处理的数据将由GA地球物理学家开展质量核查，以确保GA发布的最终数据符合使用要求。本放射性钍格网的单元格尺寸为0.00042度（约合44米），展示的是2017年南澳大利亚州塔拉里加北部航空磁测-放射性测量与数字高程模型（Digital Elevation Model, DEM）调查中钍元素的浓度，单位为百万分率（ppm）。本格网所用数据由南澳大利亚州政府（SA Government）于2017年采集完成，涵盖98230测线公里的测量数据，测线间距为200米，飞行离地高度为60米。为约束格网中的长波长信号，本次调查采用独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）的航空磁测数据，以管控该格网的基准值。