Nabberu (North), WA, 1996 (P632), 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 Nabberu (North), WA, 1996 (P632), radiometric line data, AWAGS levelled were acquired in 1996 by the WA Government, and consisted of 24400 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.

放射测量法（radiometric method），亦称伽马射线能谱法（gamma-ray spectrometric method），可探测地球表面附近的伽马射线自然变化，该变化源于钾（K）、铀（U）与钍（Th）的自然放射性衰变。所采集的数据将通过标准流程开展处理，以确保记录的响应仅由地下岩石的放射性衰变产生。处理得到的数据集可通过解译，揭示地下地质构造。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需求。本次数据集为1996年由西澳大利亚州（Western Australia, WA）政府采集的纳伯鲁（北部）1996年（编号P632）放射测量测线数据，经全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）平差校正，数据集总长24400测线公里，测线间距为400米，航空测量离地高度为80米。为约束数据中的长波长分量，研究人员引入独立数据集——AWAGS航空磁测数据，以此管控本次测量数据的基准水平。本次测线数据已基本完成AWAGS基准平差。