Mt Elizabeth thorium grid

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 91m) and shows thorium element concentration of the Mt Elizabeth, WA,1993 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1993 by the WA Government, and consisted of 50696 line-kilometres of data at 400m line spacing and 60m terrain clearance.

辐射测量法，亦称伽马射线能谱法，通过探测地球表面附近的伽马射线自然变化，表征钾（K）、铀（U）与钍（Th）的自然放射性衰变所产生的信号特征。所采集的数据将通过标准流程处理，以确保记录的响应仅源于地下岩石的放射性衰变。经处理所得的数据集可通过解译，揭示地下地质构造。经处理的数据将由澳大利亚地质调查局（Geoscience Australia，GA）的地球物理学家开展质量核验，以确保该机构发布的最终数据符合使用要求。本次发布的钍元素辐射测量网格的栅格单元尺寸为0.00083度（约合91米），展示了1993年西澳大利亚州（Western Australia，WA）伊丽莎白山（Mt Elizabeth）区域的钍元素浓度分布，单位为百万分率（ppm）。用于生成该网格的数据由西澳大利亚州政府于1993年采集，总数据量达50696测线公里，测线间距为400米，航测离地高度为60米。