GSSA Andamooka pmm Uranium 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 uranium grid has a cell size of 0.0004 degrees (approximately 41m) and shows uranium element concentration of the Andamooka Airborne Magnetic Radiometric and DEM Survey, 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 81874 line-kilometres of data at 200m line spacing and 60m terrain clearance.

辐射测量法（radiometric method，即伽马射线能谱法（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。所采集的数据将通过标准流程进行处理，以确保记录的响应仅源自地下岩石的放射性信号。经处理得到的数据集可通过解译，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，确保GA发布的最终数据符合使用需求。本辐射测量铀浓度网格的单元格尺寸为0.0004度（约合41米），展示的是2017年安达穆卡航空磁辐射测量与数字高程模型（Digital Elevation Model, DEM）调查中的铀元素浓度，单位为百万分比（ppm）。本网格所用数据由南澳州政府（SA Government）于2017年采集，总测线里程达81874线千米，测线间距为200米，飞行离地高度为60米。