GSNSW Exploration NSW Area N Menindee 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 N Menindee dose rate grid geodetic has a cell size of 0.00029 degrees (approximately 30m) and shows the terrestrial dose rate of the NSW DMR, Discovery 2000 Area N, Menindee, NSW, 1999. The data used to produce this grid was acquired in 1999 by the NSW Government, and consisted of 41736 line-kilometres of data at 150m line spacing and 40m terrain clearance.

辐射测量法（亦称伽马射线能谱法）通过检测地球表层附近的伽马射线自然波动，表征钾（K）、铀（U）与钍（Th）的自然放射性衰变所产生的辐射响应。所采集的数据将通过标准流程进行预处理，以确保记录的辐射响应仅源于地下岩石的放射性衰变。经处理得到的数据集可通过解译，用以揭示地下地质构造特征。经预处理的数据将由GA地球物理学家开展质量核验，以确保GA发布的最终数据符合使用要求。陆地剂量率网格由滤波后的钾、铀、钍网格经线性组合生成，随后对该网格应用低通滤波器，得到滤波后的陆地剂量率网格。本次的GSNSW新南威尔士州勘探区N梅宁迪剂量率大地测量网格，像元尺寸为0.00029度（约30米），展示了1999年新南威尔士州梅宁迪地区NSW DMR Discovery 2000 N区的陆地剂量率分布情况。该网格的制作数据源由新南威尔士州政府于1999年采集，总测线覆盖长度达41736线公里，测线间距为150米，地形离地高度为40米。