Northern Callabonna, SA, 2001 (TEISA) (P1139), 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 Northern Callabonna, SA, 2001 (TEISA) (P1139), radiometric line data, AWAGS levelled were acquired in 2001 by the SA Government, and consisted of 24869 line-kilometres of data at 400m line spacing and 50m 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，又称伽马射线能谱法（gamma-ray spectrometric method））可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）的天然放射性衰变所产生的辐射信号。所采集的数据将经由标准化流程开展处理，以确保记录到的响应仅源于地下岩石的放射性衰变。经处理得到的数据集可通过地质解译，揭示地下地质构造特征。经处理的数据将由GA地球物理学家进行质量核查，以确保GA发布的最终数据符合使用要求。本次数据集为2001年南澳大利亚州（South Australia, SA）政府采集的北卡拉邦纳（Northern Callabonna, SA）2001年（TEISA）（P1139）放射性测线数据，已完成AWAGS水准校正。该数据集总测线长度达24869线公里，测线间距为400米，飞行离地高度为50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——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据，对本次调查数据的基准面进行校正。本测线数据实质上已完成基于AWAGS的水准平差。