GSSA Coompana Infill 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 Coompana, SA, 2015 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2015 by the SA Government, and consisted of 286817 line-kilometres of data at a line spacing between 200m and 400m, and 80m terrain clearance.

辐射测量法，亦称伽马射线能谱法（gamma-ray spectrometric method），可探测地表附近的伽马射线自然变化，该变化源于钾（K）、铀（U）及钍（Th）的自然放射性衰变。所采集的数据将通过标准化流程进行处理，以确保记录的响应仅来自地下岩石。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的地球物理学家开展质量核验，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像元大小为0.00042度（约合43米），展示了2015年南澳大利亚州（SA）库姆帕纳（Coompana）区域的钍元素浓度，单位为百万分比（ppm）。本网格所使用的数据由南澳大利亚州政府于2015年采集，总测线里程达286817公里，测线间距介于200米至400米之间，测量时的地形离地高度为80米。