Coober Pedy - K 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 potassium grid has a cell size of 0.0004 degrees (approximately 42m) and shows potassium element concentration of the Coober Pedy West Airborne Magnetic Radiometric and DEM Survey, SA, 2017 in units of percent (or %). The data used to produce this grid was acquired in 2017 by the SA Government, and consisted of 90697 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），通过采集地球表面附近的伽马射线自然变化信号，该信号源自钾（K）、铀（U）及钍（Th）的天然放射性衰变。采集所得的数据将通过标准化流程开展处理，以确保记录的辐射响应仅源于地下岩石。经处理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GA地球物理学家开展质量核验，以确保GA发布的最终数据符合使用要求。本次放射性钾元素网格的单元尺寸为0.0004度（约42米），展示的是2017年南澳大利亚州（SA）库伯佩迪西部航空磁测与放射性测量及数字高程模型（Digital Elevation Model, DEM）调查的钾元素浓度，单位为百分比（%）。用于生成该网格的数据由南澳大利亚州政府于2017年采集，总测线长度达90697线公里，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，以校准调查网格的基准水平。