GSQ Cooper Basin ppm 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 88m) and shows thorium element concentration of the Cooper Basin North, Qld, 2008 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2008 by the QLD Government, and consisted of 168416 line-kilometres of data at 400m line spacing and 60m terrain clearance.

放射性测量法（radiometric method，又称伽马能谱测量法（gamma-ray spectrometric method））通过检测地表附近的伽马射线自然变化，用以表征钾（K）、铀（U）与钍（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化流程处理，以确保记录到的响应仅源于地下岩石的辐射。经处理得到的数据集可通过解译分析，用以揭示地下地质构造。经处理的数据将由GA地球物理学家开展质量核验，以确保GA发布的最终数据符合使用要求。
本放射性钍数据网格的单元尺寸为0.00083度（约88米），展示了2008年昆士兰州（Qld）北部库珀盆地的钍元素浓度分布，浓度单位为百万分比（parts per million，即ppm）。本数据网格所用的原始数据由昆士兰州政府（QLD Government）于2008年采集，共计168416线公里的测量数据，测线间距为400米，地形离地高度为60米。