East Mount Isa - North, Qld, 2007 (P1144), 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 East Mount Isa - North, Qld, 2007 (P1144), radiometric line data, AWAGS levelled were acquired in 2007 by the QLD Government, and consisted of 112910 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，来反映由钾（K）、铀（U）及钍（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进行处理，以确保记录的响应信号仅源自地下岩石。处理后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验，以确保GA发布的最终数据符合使用要求。本数据集为2007年采集的北伊萨山东部（昆士兰州，编号P1144）放射测量测线数据，经澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）校准。该数据由昆士兰州政府于2007年获取，总长112910测线公里，测线间距为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——来控制本次调查数据的基准水平。本次调查数据本质上已完成AWAGS基准校准。