Gympie, QLD, 1987 (P542), 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 Gympie, QLD, 1987 (P542), radiometric line data, AWAGS levelled were acquired in 1987 by the QLD Government, and consisted of 13720 line-kilometres of data at 1500m line spacing and 150m 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）可测定地球表面附近探测到的伽马射线自然变化，该射线源自钾（K）、铀（U）与钍（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的放射性贡献。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验，以确保GA发布的最终数据符合使用要求。本次数据集为1987年由昆士兰州政府（QLD Government）采集的昆士兰州金皮（Gympie）地区伽马能谱测线数据（1987年，编号P542），经澳大利亚全国航空地球物理调查（AWAGS, Australia-wide Airborne Geophysical Survey）平差校正，总测线长度达13720千米，测线间距1500米，地形离地高度150米。为抑制数据中的长波长成分，研究采用独立数据集——澳大利亚全国航空地球物理调查（AWAGS）航空磁测数据——对本次测线数据的基准值进行校正控制。本次测线数据实质上已按AWAGS标准完成平差。