Dubbo potassium 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 potassium grid has a cell size of 0.00083 degrees (approximately 85m) and shows potassium element concentration of the Dubbo Detail NSW 1991 in units of percent (or %). The data used to produce this grid was acquired in 1991 by the NSW Government, and consisted of 63636 line-kilometres of data at a line spacing between 200m and 400m, and 100m terrain clearance.

放射性测量法（radiometric），亦称伽马能谱法（gamma-ray spectrometric method），可检测地球表面附近的伽马射线自然变化，以此反映由钾（K）、铀（U）及钍（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流程进行处理，以确保记录的响应仅源自地下岩石的辐射。经处理后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地球物理学家进行质量校验，以确保GA发布的最终数据符合使用要求。该放射性钾元素网格的单元尺寸为0.00083度（约85米），展示了1991年新南威尔士州（New South Wales）达博详情区（Dubbo Detail）的钾元素浓度，单位为百分比（%）。用于生成该网格的数据由新南威尔士州政府于1991年采集，总测线长度达63636线公里，测线间距介于200米至400米之间，观测离地高度为100米。