Cobar P5009 EXT 4 dose rate grid

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 Cobar P5009 EXT 4 dose rate grid has a cell size of 0.00039074 degrees (approximately 40m) and shows the terrestrial dose rate of the Cobar Magnetic and Radiometric Survey, 2021. The data used to produce this grid was acquired in 2021 by the NSW Government, and consisted of 53617 line-kilometres of data at 200m line spacing and 60m terrain clearance.放射性（伽马射线能谱法）测量法通过检测地表附近的伽马射线自然变化，量化钾（K）、铀（U）与钍（Th）天然放射性衰变产生的辐射信号。所采集的数据将通过标准化流程处理，以确保记录的辐射响应仅源于地下岩石的放射性贡献。经处理得到的数据集可通过解译揭示地下地质构造。经处理的数据将由GA地球物理学家开展质量核查，以保障GA发布的最终数据符合使用需求。陆地剂量率网格由经滤波的钾、铀、钍网格线性组合生成，随后对该网格施加低通滤波，得到滤波后的陆地剂量率网格。本次科巴P5009 EXT 4剂量率网格的像元尺寸为0.00039074度（约40米），展示了2021年科巴磁法与放射性测量调查的陆地剂量率分布。用于生成该网格的数据由新南威尔士州政府于2021年采集，共计53617线公里的测量数据，测线间距为200米，地形离地高度为60米。