Spencer - 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 Spencer - dose rate no nasvd grid (AWAGS) has a cell size of 0.0004 degrees (approximately 41m) and shows the total dose rate of the Spencer Airborne Magnetic Radiometric and DEM survey, SA, 2018 survey. The data used to produce this grid was acquired in 2018 by the SA Government, and consisted of 49937 line-kilometres of data at 200m line spacing and 60m terrain clearance.

放射性测量法（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波动，该波动源自钾（K）、铀（U）与钍（Th）的天然放射性衰变。所采集的数据将采用标准流程进行处理，以确保记录的响应仅源于地下岩石的辐射信号。经处理后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。
总剂量率源自天然辐射源，其计算方式为将地面宇宙剂量估算值与陆地剂量相加。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，并对该网格应用低通滤波器，得到滤波后的总剂量率网格。
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项目（Gawler Craton Airborne Survey，简称GCAS），作为PACE Copper计划的组成部分。该航空地球物理测量飞行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准地球科学数据，以进一步阐明该区域的地质背景与成矿系统环境。
本次的斯宾塞总剂量率无NASVD网格（AWAGS）像元大小为0.0004度（约41米），展示了2018年南澳大利亚斯宾塞航空磁测-放射性测量与数字高程模型（Digital Elevation Model，简称DEM）测量项目的总剂量率分布。生成该网格所用的数据由南澳政府于2018年采集，涵盖49937线公里的测量数据，测线间距为200米，飞行离地高度为60米。