GSWA Wolfe Creek Crater Doserate 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 GSWA Wolfe Creek Crater Doserate Grid Geodetic has a cell size of 0.0001 degrees (approximately 11m) and shows the terrestrial dose rate of the Wolfe Creek Crater, WA, 2002. The data used to produce this grid was acquired in 2002 by the WA Government, and consisted of 402 line-kilometres of data at 50m line spacing and 40m terrain clearance.

辐射测量法（又称伽马能谱法）通过测定地球表面附近探测到的伽马射线自然变化，表征钾（K）、铀（U）与钍（Th）的天然放射性衰变所产生的辐射信号。所采集的数据将经由标准化流程处理，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校验，以确保GA发布的最终数据符合使用需求。陆地剂量率网格通过滤波后的钾、铀、钍网格的线性组合生成。对该网格应用低通滤波（low pass filter），即可得到滤波后的陆地剂量率网格。本GSWA沃尔夫溪陨石坑大地测量剂量率网格的单元格尺寸为0.0001度（约11米），展示了2002年西澳大利亚州（WA）沃尔夫溪陨石坑区域的陆地剂量率分布。用于生成该网格的数据由西澳大利亚州（WA）政府于2002年采集，总测线长度达402线公里，测线间距为50米，地形离地高度为40米。