South Australian Exploration Initiative, Area - C4, SA, 1995 (P833), 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 South Australian Exploration Initiative, Area - C4, SA, 1995 (P833), radiometric line data, AWAGS levelled were acquired in 1995 by the SA Government, and consisted of 23390 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.

辐射测量法（radiometric method），又称伽马能谱法（gamma-ray spectrometric method），可探测地球表面附近的伽马射线自然变化量，该变化源于钾（K）、铀（U）及钍（Th）的自然放射性衰变。所采集的数据将通过标准流程进行处理，以确保记录的响应信号仅来自地下岩石的放射性辐射。经处理后得到的数据集可通过解译揭示地下地质构造特征。经处理的数据会由澳大利亚地质调查局（Geoscience Australia, 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需求。

本次数据集为1995年南澳大利亚州（South Australia, SA）政府采集的南澳勘探计划C4区（南澳，1995年，编号P833）辐射测量航线数据，已完成澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）平差处理。该数据集总航线长度达23390线公里，航线间距为400米，飞行离地高度为80米。为约束数据中的长波长分量，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——对本次调查数据的基准水平进行校正。本次调查数据已基本完成AWAGS基准平差。