GSNSW Exploration NSW Area V Northern Moree 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 0.00077 degrees (approximately 80m) and shows thorium element concentration of the NSW DMR, Discovery 2000, Area V, Northern Moree, NSW 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 28696 line-kilometres of data at 400m line spacing and 80m terrain clearance.

辐射测量法（radiometric），又称伽马能谱法（gamma-ray spectrometric method），可检测地表附近的伽马射线自然变化，该变化源自钾（K）、铀（U）以及钍（Th）的天然放射性衰变。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。处理后所得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验，以确保GA发布的最终数据符合使用要求。本辐射测量钍格网的像元尺寸为0.00077度（约80米），展示了新南威尔士州（New South Wales，NSW）莫雷北部Discovery 2000项目V区（NSW DMR范围内）的钍元素浓度，单位为百万分比（ppm）。本格网所用数据由新南威尔士州政府于2001年采集，总测线长度达28696线公里，测线间距为400米，作业时的地形离地高度为80米。