Katherine-Mt Evelyn, NT, 1975/76 (P428), 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 Katherine-Mt Evelyn, NT, 1975/76 (P428), radiometric line data, AWAGS levelled were acquired in 1975 by the NT Government, and consisted of 22193 line-kilometres of data at 1500m line spacing and 150m 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（或称伽马射线光谱测量法）通过检测地球表面附近的伽马射线自然变化，反映钾（K）、铀（U）和钍（Th）的自然放射性衰变过程。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用于解释地下地质结构。GA的地球物理学家会对处理后的数据进行质量检查，确保GA发布的最终数据符合预期用途。
这套1975/76年北领地（NT）凯瑟琳-伊夫林山（Katherine-Mt Evelyn）的放射性测线数据（编号P428）经澳大利亚全国航空地球物理调查（AWAGS）校正，由NT政府于1975年采集，包含22193测线公里的数据，测线间距1500米，地形净空高度150米。为约束数据中的长波长成分，研究使用了独立的澳大利亚全国航空地球物理调查（AWAGS）航空磁测数据来控制该测线数据的基准面。该测线数据本质上已校正至AWAGS基准。