Childara - 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 Childara - dose rate no nasvd grid (AWAGS) has a cell size of 0.0004 degrees (approximately 41m) and shows the total dose rate of the Childara 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 135047 line-kilometres of data at 200m line spacing 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，表征钾（K）、铀（U）与钍（Th）的自然放射性衰变所产生的辐射信号。总剂量率源自天然辐射源，其计算方式为将地面宇宙射线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、钍网格的线性组合得到，随后对该网格施加低通滤波，以生成滤波后的总剂量率网格。所采集的数据将通过标准流程进行预处理，确保记录的辐射响应仅源于地下岩石。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（Geological Survey of South Australia）地球物理学家开展质量核查，以确保GA发布的最终数据满足使用要求。南澳大利亚地质调查局将高勒克拉通航空测量项目（Gawler Craton Airborne Survey, GCAS）列为PACE铜矿计划的子项目之一。此次航空地球物理测量作业覆盖了南澳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，为该区域矿产系统的地质背景与环境提供更多参考信息。本次奇达拉——剂量率无NASVD网格（AWAGS）的网格单元尺寸为0.0004度（约41米），展示了2017年南澳奇达拉航空磁测、放射性测量与数字高程模型（Digital Elevation Model, DEM）测量项目的总剂量率。本网格所用数据由南澳政府（SA Government）于2017年采集，包含135047线公里的测量数据，测线间距为200米，飞行离地高度为60米。