Kingoonya - 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 41m) and shows thorium element concentration of the Kingoonya Airborne Magnetic Radiometric and DEM survey, SA, 2018 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2018 by the SA Government, and consisted of 149477 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）可检测地球近地表探测到的伽马射线自然变化，此类变化源于钾（K）、铀（U）与钍（Th）的自然放射性衰变。所采集的数据将通过标准流程处理，以确保记录到的响应仅由地下岩石产生。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需求。本次钍元素放射性测量网格的单元格尺寸为0.0004度（约41米），展示了2018年南澳大利亚（South Australia，简称SA）金库尼亚航空磁测、放射性测量与数字高程模型（Digital Elevation Model，简称DEM）联合测量项目的钍元素浓度数据，单位为百万分之一（ppm）。本次网格的制作数据由南澳政府于2018年采集完成，共计149477线公里的测线数据，测线间距为200米，飞行地形离地高度为60米。为约束网格中的长波长分量，本次研究采用了独立数据集——全澳航空地球物理测量（Australia-wide Airborne Geophysical Survey，简称AWAGS）航空磁测数据，以管控该测线网格的基准值。