Tallaringa South - 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 0.0004 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.

放射测量法（亦称伽马能谱法）可检测地表附近的伽马射线自然变化，该变化由钾（K）、铀（U）与钍（Th）的自然放射性衰变所引发。所采集的数据将通过标准化流程进行处理，以确保记录的响应仅源于地下岩石的放射性衰变。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。本次放射测量钍元素网格的单元尺寸为0.0004度（约合42米），展示了2017年南澳州（SA）塔林加南航空磁测-放射测量与数字高程模型（DEM）调查中的钍元素浓度，单位为百万分之一（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线公里，测线间距为200米，飞行离地高度为60米。为抑制网格中的长波长分量，本次调查引入独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）的航空磁测数据，以管控该测网的基准值。