GSNSW Exploration NSW Area B Darling Basin 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 0.00097 degrees (approximately 100m) and shows thorium element concentration of the NSW DMR, Discovery 2000, 1994-95, AREA B, Darling Basin in units of parts per million (or ppm). The data used to produce this grid was acquired in 1995 by the NSW Government, and consisted of 150000 line-kilometres of data at 400m line spacing and 80m terrain clearance.

放射性测量法，又称伽马能谱法（gamma-ray spectrometric method），通过探测地表附近的伽马射线自然变化，反映钾（K）、铀（U）与钍（Th）的天然放射性衰变所产生的辐射信号。所采集的数据将通过标准化流程进行处理，以确保记录的响应信号仅源自地下岩石的辐射。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，以确保GA发布的最终数据符合使用需求。本放射性钍网格的单元尺寸为0.00097度（约合100米），展示的是达令盆地（Darling Basin）B区域1994-1995年度“Discovery 2000”项目中新南威尔士州矿产资源部（NSW DMR）管辖范围内的钍元素浓度，单位为百万分比（ppm）。本网格所用数据由新南威尔士州政府于1995年采集，总测线长度达15万线公里，测线间距为400米，地形离地高度为80米。