Gawler Block (Port Augusta), SA, 1975 (75SA01) (74io) (P426), radiometric line data, AWAGS levelled

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. This Gawler Block (Port Augusta), SA, 1975 (75SA01) (74io) (P426), radiometric line data, AWAGS levelled were acquired in 1975 by the SA Government, and consisted of 12693 line-kilometres of data at 1500m line spacing and 150m terrain clearance. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data. This survey data is essentially levelled to AWAGS.

放射性测量法（radiometric method，亦称伽马射线能谱法）通过检测地表附近的伽马射线自然变化，表征钾（K）、铀（U）和钍（Th）的天然放射性衰变产生的辐射信号。采集所得数据将通过标准化流程开展处理，以确保记录到的辐射响应仅由地下岩石产生。经处理得到的数据集可通过解译工作，揭示地下地质构造。处理后的数据将由GA地球物理学家进行质量核验，以确保GA发布的最终数据符合使用要求。本次数据集为南澳大利亚州（SA）1975年采集的高勒地块（Gawler Block，奥古斯塔港（Port Augusta）区域）经全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey，简称AWAGS）校正的放射性测线数据，对应编号为75SA01、74io、P426。该数据由南澳州政府采集，总测线长度达12693线公里，测线间距为1500米，飞行离地高度为150米。为约束数据中的长波长分量，本次处理采用了独立数据集——AWAGS航空磁测数据，以校正本次调查数据的基准水平。本次调查数据已基本校正至AWAGS基准体系。