GSQ Mt Isa Southwest doserate 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. The terrestrial dose rate grid is derived as a linear combination of the filtered K, U and Th grids. A low pass filter is applied to this grid to generate the filtered terrestrial dose rate grid.This GSQ Mt Isa Southwest doserate grid geodetic has a cell size of 0.00083 degrees (approximately 88m) and shows the terrestrial dose rate of the Mount Isa South West, Qld, 2006. The data used to produce this grid was acquired in 2006 by the QLD Government, and consisted of 139836 line-kilometres of data at 400m line spacing and 80m terrain clearance.

放射能（或称伽马射线能谱）法通过检测地表附近的伽马射线自然变化量开展测量，此类射线源自钾（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于地下岩石。经处理后得到的数据集可通过解译，揭示地下地质构造特征。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对外发布的最终数据符合使用要求。地表剂量率网格通过经滤波处理的钾、铀、钍网格的线性组合生成，随后对该网格施加低通滤波，得到滤波后的地表剂量率网格。本次GSQ伊萨山西南（Mt Isa Southwest）剂量率大地测量网格的单元格尺寸为0.00083度（约88米），展示了2006年昆士兰州伊萨山西南区域的地表剂量率分布。制作该网格所用的数据由昆士兰州政府于2006年采集，总数据覆盖长度达139836线公里，测线间距为400米，地形离地高度为80米。