GSQ Southern Bowen Basin Qld 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 0.001 degrees (approximately 106m) and shows thorium element concentration of the Southern Bowen Basin, Qld, 2004 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2004 by the QLD Government, and consisted of 74554 line-kilometres of data at 400m line spacing and 80m terrain clearance.放射性测量法（或称伽马能谱法）通过检测地球表面附近的伽马射线自然变化，表征钾（K）、铀（U）和钍（Th）发生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由地下岩石的辐射产生。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。 本放射性钍网格的像元尺寸为0.001度（约106米），展示了2004年昆士兰州鲍恩盆地南部的钍元素浓度分布，单位为百万分率（parts per million，简称ppm）。用于生成该网格的数据由昆士兰州政府于2004年采集，共计74554测线公里的有效数据，测线间距为400米，作业离地高度为80米。