GSSA Warrina Thorium concentration 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 87m) and shows thorium element concentration of the Marree-Warrina Airborne Magnetic & Radiometric Survey, SA, 2012 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2012 by the SA Government, and consisted of 132484 line-kilometres of data at 400m line spacing and 80m terrain clearance.

辐射测量法（radiometric method，又称伽马能谱法）通过检测地球表面附近的伽马射线自然变化，获取由钾（K）、铀（U）和钍（Th）的天然放射性衰变所产生的信号。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于地下岩石。最终生成的数据集可通过解译揭示地下地质构造。经过处理的数据将由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需求。
本次发布的放射性钍格网单元格大小为0.00083度（约87米），展示了2012年南澳大利亚州（SA）Marree-Warrina航空磁测与辐射测量调查项目的钍元素浓度，单位为百万分比（ppm）。用于制作该格网的数据由南澳大利亚州政府于2012年采集，总测线长度达132484测线公里，测线间距为400米，地形离地高度为80米。