Frome 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 0.00083 degrees (approximately 86m) and shows thorium element concentration of the Frome, SA, Broken Hill Exploration Initiative, 1995 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1995 by the SA Government, and consisted of 68300 line-kilometres of data at 400m line spacing and 80m terrain clearance.

放射性测量法（radiometric），亦称伽马能谱法（gamma-ray spectrometric），通过采集地表附近的伽马射线自然变化数据，此类变化由钾（K）、铀（U）及钍（Th）的天然放射性衰变所产生。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于地下岩石的辐射。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校验，以确保GA发布的最终数据符合使用要求。本放射性钍格网数据的格网单元尺寸为0.00083度（约合86米），展示的是1995年南澳大利亚弗罗姆（Frome）地区布鲁肯希尔勘探计划的钍元素浓度分布，数据单位为百万分比（ppm）。本格网数据所用的原始资料由南澳大利亚州政府于1995年采集完成，总测线长度达68300千米，测线间距为400米，飞行离地高度为80米。