West Pilbara 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 West Pilbara total count grid geodetic has a cell size of 0.001 degrees (approximately 100m) and shows the terrestrial dose rate of the West Pilbara, WA, 1995. The data used to produce this grid was acquired in 1995 by the WA Government, and consisted of 75096 line-kilometres of data at 400m line spacing and 80m terrain clearance.

放射测量法（亦称伽马射线能谱法）通过检测地球表面附近的伽马射线自然变化开展测量工作，该变化由钾（K）、铀（U）和钍（Th）的天然放射性衰变所致。所采集的数据将通过标准流程进行处理，以确保记录到的响应仅源自地下岩石的放射性作用。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。陆地剂量率网格通过经过滤的钾、铀、钍网格的线性组合生成。随后对该网格施加低通滤波，得到过滤后的陆地剂量率网格。本西皮尔巴拉总计数大地网格的单元尺寸为0.001度（约100米），展示了1995年西澳大利亚州西皮尔巴拉地区的陆地剂量率分布情况。用于生成该网格的数据由西澳大利亚州政府于1995年采集，涵盖75096线公里的测量数据，测线间距为400米，飞行离地高度为80米。