GSQ Hodgkinson Georgetown Block D Qld 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 0.00096 degrees (approximately 104m) and shows thorium element concentration of the Hodgkinson-Georgetown Block D, QLD, 2000, Prospectivity Plus Init. in units of parts per million (or ppm). The data used to produce this grid was acquired in 2000 by the QLD Government, and consisted of 97568 line-kilometres of data at a line spacing between 200m and 400m, and 80m terrain clearance.

放射性测量法（radiometric method），又称伽马能谱法（gamma-ray spectrometric method），通过检测地表附近的伽马射线自然变化量，以反映钾（K）、铀（U）与钍（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处理，确保记录的响应仅源自地下岩石的放射性信号。经处理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验，以确保GA发布的最终数据符合使用要求。
该放射性钍网格的像元大小为0.00096度（约104米），以百万分比（ppm）为单位展示了2000年昆士兰州（QLD）霍奇金森-乔治敦区块D的钍元素浓度数据，相关数据由探矿潜力增强倡议（Prospectivity Plus Init.）提供。制作该网格所用的数据由昆士兰州政府于2000年采集，总测线长度达97568线公里，测线间距为200米至400米，地形离地高度为80米。