Angas Bremer Plains potassium grid geodetic

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 0.00021 degrees (approximately 21m) and shows potassium element concentration of the SMMSP - MagSpec - Angas Bremer Plains, SA, 2002 (2002/01) in units of percent (or %). The data used to produce this grid was acquired in 2002 by the SA Government, and consisted of 7535 line-kilometres of data at 100m line spacing and 60m terrain clearance.

放射性测量法（radiometric method，亦称伽马能谱法（gamma-ray spectrometric method））通过探测地球表面附近的伽马射线自然变化，表征钾（K）、铀（U）及钍（Th）的天然放射性衰变所产生的信号特征。所采集的数据将通过标准流程进行预处理，确保记录到的响应仅来自地下岩石的放射性衰变。经处理得到的数据集可通过解译，用以揭示地下地质构造特征。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需求。本次发布的放射性钾元素栅格数据，栅格单元尺寸为0.00021度（约合21米），展示了2002年南澳大利亚州（South Australia, SA）安加斯-布雷默平原（Angas Bremer Plains）SMMSP - MagSpec项目（2002/01）的钾元素浓度分布，浓度单位为百分比（%）。该栅格数据所用的原始数据由南澳大利亚州政府于2002年采集，总测线长度达7535千米，测线间距为100米，飞行离地高度为60米。