Helen Springs - Shandon, NT, 1993 (P611), 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 Helen Springs - Shandon, NT, 1993 (P611), radiometric line data, AWAGS levelled were acquired in 1993 by the NT Government, and consisted of 117753 line-kilometres of data at a line spacing between 300m and 500m, 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.

放射性测量法（radiometric method），亦称伽马能谱法（gamma-ray spectrometric method），通过探测地表附近的伽马射线自然变化，来反映钾（K）、铀（U）与钍（Th）的天然放射性衰变所产生的辐射信号。所采集的数据将通过标准流程处理，以确保记录的响应信号仅来自地下岩石的辐射。经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核查，以确保GA发布的最终数据满足使用需求。本次数据集为1993年由北领地（Northern Territory, NT）政府采集的海伦斯普林斯-尚登（Helen Springs - Shandon）地区1993年（编号P611）、经澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）平差校正的放射性测量航线数据，总航线长度达117753线公里，航线间距介于300米至500米之间，飞行离地高度为100米。为约束数据中的长波长区域背景信号，研究人员采用独立数据集——澳大利亚全国航空地球物理调查（AWAGS）航空磁测数据——来校正本次调查数据的基准值。本次调查数据本质上已基于AWAGS完成平差校正。