Georgina NE, NT, 2002 (P1022), 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 Georgina NE, NT, 2002 (P1022), radiometric line data, AWAGS levelled were acquired in 2002 by the NT Government, and consisted of 108159 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（radiometric method），又称伽马射线能谱法（gamma-ray spectrometric method），通过探测地球表面附近的伽马射线自然变化，定量检测由钾（K）、铀（U）及钍（Th）自然放射性衰变所产生的辐射信号。所采集的数据将通过标准流程进行处理，以确保记录的响应信号仅来源于地下岩石的辐射。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校验，以确保GA发布的最终数据符合使用需求。本次数据集为2002年由北领地（NT）政府采集的乔治娜东北部（Georgina NE）航空放射性测线数据（编号P1022），经全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey，简称AWAGS）校正平差，测线总长度达108159测线公里，测线间距为400米，飞行离地高度为80米。为约束数据中的长波长分量，本次处理引入独立数据集——全澳航空地球物理调查（AWAGS）航空磁测数据——以管控本次测线数据的基准水平。本次测线数据已基本校正至AWAGS基准体系。