Lake Eyre - dose rate no nasvd grid (AWAGS)

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 total dose rate is due to natural sources of radiation and is computed by adding estimates of cosmic dose at ground level to the terrestrial dose. 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 total dose rate grid. The Geological Survey of South Australia commissioned the Gawler Craton Airborne Survey (GCAS) as part of the PACE Copper initiative. The airborne geophysical survey was flown over parts of the Gawler Craton in South Australia. The program was designed to capture new baseline geoscientific data to provide further information on the geological context and setting of the area for mineral systems. This Lake Eyre - dose rate no nasvd grid (AWAGS) has a cell size of 0.0004 degrees (approximately 41m) and shows the total dose rate of the Lake Eyre Airborne Magnetic Radiometric and DEM survey, SA, 2017 survey. The data used to produce this grid was acquired in 2017 by the SA Government, and consisted of 92215 line-kilometres of data at 200m line spacing and 60m terrain clearance.

辐射测量法（radiometric method，又称伽马射线能谱法）可探测地球表面附近的伽马射线自然变化，该变化源于钾（K）、铀（U）及钍（Th）的自然放射性衰变。采集得到的数据将通过标准流程进行处理，以确保记录的响应仅来自地下岩石。处理后的数据可通过解译揭示地下地质构造，由此生成数据集。GA地球物理学家将对处理后的数据开展质量核验，以确保GA发布的最终数据符合使用要求。总剂量率源于自然辐射源，其计算方式为将地面宇宙剂量估算值与陆地剂量相加得到。陆地剂量率网格通过过滤后的钾、铀、钍网格的线性组合推导得出。对该网格应用低通滤波器（low pass filter），即可生成经过滤的总剂量率网格。南澳大利亚地质调查局（Geological Survey of South Australia）委托开展了高勒克拉通航空测量（Gawler Craton Airborne Survey, GCAS），作为PACE Copper计划的一部分。此次航空地球物理测量的飞行区域覆盖了南澳大利亚境内的部分高勒克拉通区域。本项目旨在获取全新的基础地球科学数据，以进一步阐明该区域的地质背景与环境，为矿产系统研究提供支撑。本艾尔湖-剂量率无nasvd网格（AWAGS）的单元格大小为0.0004度（约41米），展示了2017年南澳大利亚艾尔湖航空磁测辐射测量与数字高程模型（Digital Elevation Model，DEM）测量的总剂量率数据。用于生成该网格的数据由南澳大利亚州政府于2017年采集，总数据覆盖里程达92215线公里，测线间距为200米，飞行离地高度为60米。