Litchfield North, NT, 1981 (P535), 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 North, NT, 1981 (P535), radiometric line data, AWAGS levelled were acquired in 1981 by the NT Government, and consisted of 36434 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.

辐射测量法（又称伽马射线光谱法，gamma-ray spectrometric method）通过测量地球表面附近探测到的伽马射线自然变化，研究钾（K）、铀（U）和钍（Th）的自然放射性衰变现象。采集的数据经标准方法处理，确保记录的响应仅来源于地下岩石。处理结果生成的数据集可通过解译揭示地下地质结构。处理后的数据由GA地球物理学家进行质量检查，确保GA发布的最终数据符合预期用途。

这套1981年北领地（NT）利奇菲尔德北部（P535）经AWAGS校正的辐射测量测线数据由NT政府于1981年采集，包含36434测线公里的数据，测线间距500米，地形净空高度（terrain clearance）100米。为约束数据中的长波长成分，研究采用独立数据集——澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey，简称AWAGS）的航空磁测数据——控制该调查数据的基准面。该调查数据本质上已校正至AWAGS基准。