MIM Mt Isa Inlier ppm uranium 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 uranium grid has a cell size of 0.00042 degrees (approximately 45m) and shows uranium element concentration of the MIM Data from Mt Isa Inlier, QLD in units of parts per million (or ppm). The data used to produce this grid was acquired in 1990 by the QLD Government, and consisted of 676318 line-kilometres of data at a line spacing between 200m and 400m, and 80m terrain clearance.

辐射测量法（radiometric method，亦称伽马射线能谱法（gamma-ray spectrometric method））可检测地表附近的伽马射线自然变化，此类变化源于钾（K）、铀（U）与钍（Th）的天然放射性衰变。所采集的数据将通过标准化流程进行处理，以确保记录到的信号仅源于地下岩石。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校验，确保GA发布的最终数据符合使用要求。本辐射测量铀网格的单元格尺寸为0.00042度（约45米），展示的是昆士兰州（QLD）芒特艾萨地块（Mt Isa Inlier）MIM数据中的铀元素浓度，单位为百万分之一（ppm）。本网格所用数据由昆士兰州政府于1990年采集，总测线长度达676318线公里，测线间距介于200米至400米之间，飞行离地高度为80米。