Tiwi Islands, NT, 2006 (P1137), 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 Tiwi Islands, NT, 2006 (P1137), radiometric line data, AWAGS levelled were acquired in 2006 by the NT Government, and consisted of 30001 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，亦称伽马能谱法（gamma-ray spectrometric method））通过检测地球表面附近的伽马射线自然变化，以反映钾（K）、铀（U）和钍（Th）的自然放射性衰变过程。所采集的数据将通过标准流程进行处理，以确保记录的探测响应仅源于地下岩石的放射性衰变。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地球物理学家开展质量检查，以确保GA发布的最终数据满足应用需求。本数据集为2006年北领地（NT）提维群岛（Tiwi Islands）放射性测线数据（编号P1137），经AWAGS校正，由北领地政府于2006年采集，总测线长度达30001测线公里，测线间距为400米，飞行地形离地高度为80米。为约束数据中的长波长分量，本次调查采用了独立数据集：全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据，用于校正本次测线数据的基准电平。本测线数据已基本匹配AWAGS的校正基准。