GSQ Westmoreland 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 90m) and shows thorium element concentration of the Westmoreland, Qld, 2007 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2006 by the QLD Government, and consisted of 60570 line-kilometres of data at 400m line spacing and 60m terrain clearance.

辐射测量法（或称伽马射线能谱法）通过探测地球表面附近的伽马射线自然变化，可反映钾（K）、铀（U）与钍（Th）的自然放射性衰变所产生的辐射信号。所采集的数据将通过标准化流程开展处理，以确保记录的响应信号仅源于地下岩石的辐射。经处理得到的数据集经解译后，可揭示地下地质构造特征。经处理的数据将由GA地球物理学家进行质量核验，以确保GA发布的最终数据满足使用需求。本次辐射测量钍元素网格的单元格尺寸为0.00083度（约合90米），展示了2007年昆士兰州（Qld）韦斯特摩兰（Westmoreland）地区的钍元素浓度分布，浓度单位为百万分率（ppm）。用于生成该网格的数据由昆士兰州政府于2006年采集，涵盖总长60570测线公里的测量数据，测线间距为400米，航空测量离地高度为60米。