GSNSW Exploration NSW Area U Southern Peel thorium 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 thorium grid has a cell size of 0.00048 degrees (approximately 50m) and shows thorium element concentration of the NSW DMR, Discovery 2000, AREA U, SOUTHERN PEEL, NSW 2001 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2001 by the NSW Government, and consisted of 31584 line-kilometres of data at 250m line spacing and 80m terrain clearance.

放射性测量法（radiometric method），又称伽马射线能谱法（gamma-ray spectrometric method），可通过探测地球表面附近的伽马射线自然变化，反映钾（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化处理流程进行质控，确保记录到的信号仅源于地下岩石的放射性衰变。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发布的最终数据满足使用需求。本放射性钍元素网格数据的格网单元尺寸为0.00048度（约合50米），展示了新南威尔士州矿产资源局（NSW DMR）2001年勘探项目（Discovery 2000）U区（AREA U）、南部皮尔（SOUTHERN PEEL）区域（邮编NSW 2001）的钍元素浓度，单位为百万分比（ppm）。本网格数据所用的原始数据由新南威尔士州政府于2001年采集，总测线长度达31584线公里，测线间距为250米，地形净空高度为80米。