Litchfield South Area A, NT, 1984 (P541), 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 Litchfield South Area A, NT, 1984 (P541), radiometric line data, AWAGS levelled were acquired in 1984 by the NT Government, and consisted of 26132 line-kilometres of data at 500m line spacing and 100m 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，又称伽马射线能谱法（gamma-ray spectrometric method），通过采集地表附近的伽马射线自然变化数据，反演由钾（K）、铀（U）及钍（Th）自然放射性衰变产生的辐射信号。所采集的数据将通过标准化流程处理，以确保记录的响应信号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解译，揭示地下地质构造特征。经处理的数据将由澳大利亚地质调查局（Geoscience Australia，简称GA）的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需求。本次数据集为北领地（Northern Territory，简称NT）1984年采集的利奇菲尔德南区A区（P541）伽马射线能谱测线数据，经澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, 简称AWAGS）基准平差校正。该数据由北领地政府于1984年采集，总测线长度达26132线公里，测线间距为500米，飞行离地高度为100米。为校正数据中的长波长漂移，本数据集采用独立的AWAGS航空磁测数据作为基准参照，对本次测线数据的基准值进行管控。本次调查数据已基本完成AWAGS基准平差处理。