GSWA South Canning 1 Madley Herbert 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 Madley-Herbert, WA, 2010 (South Canning 1) in units of parts per million (or ppm). The data used to produce this grid was acquired in 2010 by the WA Government, and consisted of 96079 line-kilometres of data at 400m line spacing and 60m terrain clearance.

辐射测量法（radiometric method），亦称伽马射线能谱法（gamma-ray spectrometric method），可探测地球表面附近的伽马射线自然变化，以此反映钾（K）、铀（U）与钍（Th）的天然放射性衰变所产生的辐射响应。所采集的数据将通过标准化流程进行处理，以确保记录下的响应仅源自地下岩石的辐射。经处理后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查，以确保GA发布的最终数据符合使用要求。
该辐射测量钍元素网格的单元尺寸为0.00083度（约88米），展示了2010年西澳大利亚州（WA）马德利-赫伯特（Madley-Herbert）地区（南坎宁1区）的钍元素浓度，单位为百万分之一（ppm）。用于生成该网格的数据由西澳大利亚州政府（WA Government）于2010年采集，总测线长度为96079线公里，测线间距为400米，地形离地高度为60米。