SA Exploration Initiative - Area B4, SA, 1993 (P701), 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 SA Exploration Initiative - Area B4, SA, 1993 (P701), radiometric line data, AWAGS levelled were acquired in 1993 by the SA Government, and consisted of 75571 line-kilometres of data at 400m line spacing and 80m 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（即伽马射线能谱法，gamma-ray spectrometric method）通过探测地表附近的伽马射线自然变化，表征由钾（K）、铀（U）与钍（Th）天然放射性衰变产生的辐射特征。所采集的数据将通过标准化流程处理，以确保记录的响应仅源于地下岩石的辐射。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查，以确保GA发布的最终数据满足应用需求。
本次数据集为1993年南澳大利亚（South Australia, SA）政府采集的“南澳勘探计划-B4区1993年（P701）”伽马射线能谱测线数据（经全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）校正），测线总长度达75571线公里，线间距为400米，地形离地高度为80米。
为约束数据中的长波长分量，本次调查采用独立数据集——全澳航空地球物理调查（AWAGS）航空磁测数据——来控制测线数据的基准电平。本测线数据本质上已校正至AWAGS基准体系。