GSWA Central Canning GA Onshore Canning 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 89m) and shows thorium element concentration of the GSWA Central Canning, GA Onshore Canning merge, 2007-2009 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2007 by the WA Government, and consisted of 175415 line-kilometres of data at 800m line spacing and 60m terrain clearance.

放射性测量法（radiometric method），亦称伽马能谱法（gamma-ray spectrometric method），可检测地表附近伽马射线的自然波动，此类波动由钾（K）、铀（U）与钍（Th）的天然放射性衰变产生。所采集的数据将通过标准流程处理，以确保记录的响应仅由地下岩石引发。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，确保GA发布的最终数据符合使用要求。本放射性钍格网的像元尺寸为0.00083度（约89米），展示了2007-2009年GSWA中部坎宁区域与GA陆上坎宁合并项目的钍元素浓度分布，单位为百万分率（parts per million，简称ppm）。用于生成该格网的数据由西澳政府于2007年采集，总数据长度达175415线公里，测线间距为800米，地形离地高度为60米。