GSQ East Isa North 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 East Mount Isa - North, Qld, 2007 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2007 by the QLD Government, and consisted of 112910 line-kilometres of data at 400m line spacing and 80m terrain clearance.

放射性测量法（radiometric method，又称伽马射线能谱法）通过检测地球表面附近的伽马射线自然变化开展测量，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化流程进行处理，以确保记录到的响应仅源自地下岩石。经处理得到的数据集可通过解译，用以揭示地下地质构造。GA的地球物理学家将对处理后的数据开展质量核验，以确保GA发布的最终数据满足使用需求。
本次发布的放射性钍网格数据单元尺寸为0.00083度（约合89米），展示了2007年昆士兰州（QLD）东伊萨山北部区域的钍元素浓度，单位为百万分之一（ppm）。本网格所用数据由昆士兰州政府于2007年采集，总测线长度达112910线公里，测线间距为400米，地形离地高度为80米。