Menindee NW (Thackaringa Redan) 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 0.00021 degrees (approximately 21m) and shows thorium element concentration of the Menindee NW,(Thackaringa,Redan), Broken Hill Explor. Init,NSW,1995 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 55233 line-kilometres of data at a line spacing between 100m and 200m, and 60m terrain clearance.

放射性测量法（radiometric method），或称伽马能谱法（gamma-ray spectrometric method），可通过探测地表附近的伽马射线自然变化，表征钾（K）、铀（U）与钍（Th）的天然放射性衰变所产生的辐射响应。所采集的数据将通过标准流程进行处理，确保记录的响应仅源自地下岩石。经处理得到的数据集可用于解译，以揭示地下地质结构。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。本放射性钍元素栅格数据的单元尺寸为0.00021度（约合21米），展示了1995年新南威尔士州布罗肯希尔勘探计划中梅宁迪西北部（塔卡林加、雷丹）区域的钍元素浓度，单位为百万分率（ppm）。用于生成该栅格的数据由新南威尔士州政府于1995年采集，涵盖55233测线公里的实测数据，测线间距介于100米至200米之间，离地高度为60米。