Barkly - Ranken, NT, 2001 (P1018), 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 Barkly - Ranken, NT, 2001 (P1018), radiometric line data, AWAGS levelled were acquired in 2001 by the NT Government, and consisted of 301463 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），通过探测地表附近的伽马射线自然变化，定量反映钾（K）、铀（U）及钍（Th）自然放射性衰变产生的伽马辐射强度变化。采集所得数据将通过标准化流程处理，以确保记录的响应仅源于地下岩石的辐射贡献。经处理得到的数据集可通过解译揭示地下地质构造特征。处理后的数据将由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。本次数据集为北领地（NT）政府于2001年采集的巴克利-兰肯（Barkly-Ranken）地区2001年（P1018）伽马射线能谱测线数据，经AWAGS平差校正，总测线长度达301463线公里，测线间距为400米，飞行离地高度为80米。为压制数据中的长波长信号，本次调查采用独立数据集——澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——来控制测线数据的基准面水平，本测线数据已基本按AWAGS标准完成平差校正。