Hann River, Qld, 1991 (P570), 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 Hann River, Qld, 1991 (P570), radiometric line data, AWAGS levelled were acquired in 1991 by the QLD Government, and consisted of 55546 line-kilometres of data at 400m line spacing 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.

辐射测量法（radiometric method），又称伽马射线能谱法（gamma-ray spectrometric method），可检测地表附近的伽马射线自然变化，此类变化源于钾（K）、铀（U）及钍（Th）的天然放射性衰变。所采集的数据将通过标准流程进行处理，以确保记录的响应仅源于地下岩石。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发布的最终数据符合使用要求。本数据集为1991年采集的昆士兰州（Queensland, Qld）汉河（Hann River）辐射测量剖面数据（编号P570），已校准至澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）标准。该数据由昆士兰州政府于1991年完成采集，总测线长度达55546测线公里，测线间距为400米，地形离地高度为100米。为约束数据中的长波长分量，本次调查采用独立数据集——澳大利亚全国航空地球物理调查（AWAGS）航空磁测数据——对测区数据的基准值进行校正。本次调查数据已基本校准至AWAGS标准。