GSNSW Grafton Tenterfield 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 0.0005 degrees (approximately 52m) and shows uranium element concentration of the Grafton - Tenterfield, NSW, 2011 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2011 by the NSW Government, and consisted of 100488 line-kilometres of data at 250m line spacing and 60m terrain clearance.

放射性测量法（radiometric method），又称伽马射线能谱法，通过探测地表附近的伽马射线自然变化，反映钾（potassium, K）、铀（uranium, U）与钍（thorium, Th）的自然放射性衰变产生的信号特征。所采集的数据将通过标准化流程处理，以确保记录的响应信号仅来源于地下岩石的放射性作用。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。
本次放射性铀元素网格的单元尺寸为0.0005度（约合52米），展示了2011年新南威尔士州（New South Wales, NSW）格拉夫顿-滕特菲尔德区域的铀元素浓度，单位为百万分比（parts per million, ppm）。该网格的原始数据集由新南威尔士州政府于2011年采集，总测线长度达100488线公里，测线间距为250米，地形离地高度为60米。