Flinders Ranges 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 Flinders Ranges dose rate grid geodetic has a cell size of 0.00042 degrees (approximately 43m) and shows the terrestrial dose rate of the Flinders Ranges, SA, 1998. The data used to produce this grid was acquired in 1999 by the SA Government, and consisted of 127752 line-kilometres of data at a line spacing between 200m and 400m, and 60m terrain clearance.

放射性测量法（又称伽马能谱法）通过探测地球表面附近的伽马射线自然变化，以此反映钾（K）、铀（U）与钍（Th）的自然放射性衰变所产生的辐射信号。所采集的数据将通过标准化流程进行处理，以确保记录的响应仅源于地下岩石的辐射。经处理后得到的数据集可用于解译，以揭示地下地质构造。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需求。地面剂量率网格通过滤波后的钾、铀、钍网格的线性组合得到，随后对该网格应用低通滤波器，生成滤波后的地面剂量率网格。本次发布的弗林德斯山脉大地剂量率网格单元尺寸为0.00042度（约43米），展示了1998年南澳大利亚州弗林德斯山脉的地面剂量率分布。用于生成该网格的数据由南澳大利亚州政府于1999年采集，总测线长度达127752线公里，测线间距介于200米至400米之间，地形离地高度为60米。