GSWA Eucla Basin 4 Madura 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 0.00042 degrees (approximately 43m) and shows thorium element concentration of the Madura, WA, 2010 (Eucla Basin 4) 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 103672 line-kilometres of data at 200m line spacing and 50m 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，该信号源于钾（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流程进行处理，以确保记录的响应仅源自地下岩石。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，以确保GA发布的最终数据符合使用要求。
本辐射测量钍元素网格的单元尺寸为0.00042度（约合43米），展示了2010年西澳大利亚州（Western Australia，WA）马杜拉区域尤克拉盆地4区块（Eucla Basin 4）的钍元素浓度，单位为百万分率（parts per million，ppm）。本网格所用数据由西澳大利亚州政府于2010年采集，总测线长度达103672线千米，测线间距为200米，地形离地高度为50米。