GSNSW Exploration NSW Area F Brewarrina total count 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 F Brewarrina total count grid geodetic has a cell size of 0.00121 degrees (approximately 125m) and shows the terrestrial dose rate of the NSW DMR, Discovery 2000, 1994-95, AREA F, Brewarrina. The data used to produce this grid was acquired in 1995 by the NSW Government, and consisted of 51199 line-kilometres of data at 250m line spacing and 60m terrain clearance.

放射测量法（radiometric method），亦称伽马能谱法（gamma-ray spectrometric method），通过探测地表附近的伽马射线自然变化，获取由钾（K）、铀（U）和钍（Th）天然放射性衰变产生的信号。所采集的数据将通过标准流程处理，确保所记录的响应仅源于地下岩石。由此生成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、钍网格的线性组合得到，随后对该网格施加低通滤波器，生成滤波后的地表剂量率网格。本次GSNSW勘探项目新南威尔士州F区布雷瓦里纳大地测量总计数网格，格网单元尺寸为0.00121度（约125米），展示了1994-1995年新南威尔士州矿产资源部（NSW DMR）"Discovery 2000"项目中布雷瓦里纳F区的地表剂量率分布。用于生成该网格的数据由新南威尔士州政府于1995年采集，共涵盖51199线公里的测量数据，测线间距为250米，地形离地高度为60米。