GSQ Isa Georgetown Block A Qld dose rate 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 Isa Georgetown Block A Qld dose rate grid geodetic has a cell size of 0.00042 degrees (approximately 45m) and shows the terrestrial dose rate of the Isa-Georgetown Block A,QLD, 2000, Prospectivity Plus Initiative. The data used to produce this grid was acquired in 2000 by the QLD Government, and consisted of 34868 line-kilometres of data at a line spacing between 200m and 400m, and 80m terrain clearance.

放射测量法（radiometric method），又称伽马射线能谱法（gamma-ray spectrometric method），可通过探测地球表面附近的伽马射线自然变化，反映由钾（K）、铀（U）及钍（Th）的天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流程进行处理，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可通过解译，揭示地下地质构造特征。GA的地球物理学家会对处理后的数据开展质量校验，确保GA发布的最终数据符合应用需求。地面剂量率网格（terrestrial dose rate grid）通过滤波后的钾、铀、钍网格的线性组合生成，随后对该网格应用低通滤波器（low pass filter），得到滤波后的地面剂量率网格。本数据集为GSQ艾萨-乔治敦A区块昆士兰州（QLD）地面剂量率大地测量网格，其网格单元尺寸为0.00042度（约45米），展示了2000年“远景增强倡议（Prospectivity Plus Initiative）”下昆士兰州艾萨-乔治敦A区块的地面剂量率分布。用于生成该网格的数据由昆士兰州政府（QLD Government）于2000年采集，总测线长度达34868测线公里，测线间距介于200米至400米之间，地形离地高度为80米。