McArthur Basin, NT, 1978 (P449), 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 McArthur Basin, NT, 1978 (P449), radiometric line data, AWAGS levelled were acquired in 1978 by the NT Government, and consisted of 51579 line-kilometres of data at 3000m 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），亦称伽马能谱法，通过检测地表附近的伽马射线自然变化量，表征由钾（K）、铀（U）与钍（Th）的天然放射性衰变所产生的辐射响应。所采集的数据将通过标准化流程进行处理，以确保记录的响应仅由地下岩石的辐射产生。经处理得到的数据集可通过解译，揭示地下地质构造特征。经处理的数据将由GA地球物理学家开展质量核查，以确保GA发布的最终数据符合使用要求。
本次1978年北领地（NT）麦克阿瑟盆地（McArthur Basin）的伽马能谱测线数据（编号P449）经澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）基准平差校正，由北领地政府于1978年采集完成，总测线长度达51579线公里，测线间距为3000米，地形离地高度为150米。为约束数据中的长波长信号，研究人员采用独立数据集——澳大利亚全国航空地球物理调查（AWAGS）航空磁测数据——来控制本次调查数据的基准水平。本次调查数据实质上已完成AWAGS基准平差校正。