Roper River - Roper, NT, 1993 (P610), 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 Roper River - Roper, NT, 1993 (P610), radiometric line data, AWAGS levelled were acquired in 1993 by the NT Government, and consisted of 19738 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（radiometric method）又称伽马能谱法（gamma-ray spectrometric method），通过探测地表附近的伽马射线自然变化获取数据，该变化源于钾（K）、铀（U）与钍（Th）的天然放射性衰变过程。所采集的数据将通过标准流程处理，以确保记录的响应信号仅源自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需求。本次1993年北领地罗珀河-罗珀地区（P610）经全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）平差的伽马能谱测线数据，由北领地政府于1993年采集完成，数据总长19738测线公里，测线间距为500米，飞行离地高度为100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，对测线数据的基准面进行校正。本测线数据实质上已基于AWAGS完成平差处理。