GSNSW Exploration NSW Area O NW Eromanga 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 GSNSW Exploration NSW Area O NW Eromanga dose rate grid geodetic has a cell size of 0.00077 degrees (approximately 80m) and shows the terrestrial dose rate of the NSW DMR, Discovery 2000, AREA O, NW EROMANGA, NSW 2000. The data used to produce this grid was acquired in 2000 by the NSW Government, and consisted of 54898 line-kilometres of data at a line spacing between 200m and 400m, and 60m terrain clearance.

辐射测量法（伽马射线能谱法，gamma-ray spectrometric method）可检测近地表伽马射线的自然波动，此类波动由钾（K）、铀（U）及钍（Th）的天然放射性衰变引发。所采集的数据将通过标准化处理流程进行校正，以确保记录的辐射响应仅源于地下岩石。经处理得到的数据集可用于解译，以揭示地下地质构造。经处理的数据将由GA地球物理学家开展质量核验，确保GA发布的最终数据符合使用要求。地表剂量率网格通过滤波后的钾、铀、钍网格的线性组合生成，随后对该网格施加低通滤波器（low pass filter），得到滤波后的地表剂量率网格。本次的GSNSW新南威尔士州勘探区O区西北埃罗曼加地表剂量率大地测量网格，单元尺寸为0.00077度（约80米），展示了新南威尔士州DMR、Discovery 2000、O区、西北埃罗曼加（NSW 2000）区域的地表剂量率分布。本网格的制作数据由新南威尔士州政府于2000年采集，共包含54898测线公里的测量数据，测线间距介于200米至400米之间，飞行离地高度为60米。