Walsh (Mt Mulgrave 1:100 000), Qld, 1991 (P579), 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 Walsh (Mt Mulgrave 1:100 000), Qld, 1991 (P579), radiometric line data, AWAGS levelled were acquired in 1991 by the QLD Government, and consisted of 12635 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，亦称伽马射线能谱法）通过采集地表附近的伽马射线自然变化数据，以表征钾（K）、铀（U）与钍（Th）天然放射性衰变所产生的辐射信号特征。所采集的数据将通过标准流程进行预处理，确保记录的响应仅源自地下岩石的辐射信号。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，以保障GA发布的最终数据满足应用需求。
本次发布的数据集为1991年由昆士兰州（QLD）政府采集的沃尔什（芒特马尔格雷夫1:10万幅，昆士兰州，1991年，编号P579）辐射测量航线数据，该数据已完成全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）基准平差，总航线长度达12635线公里，航线间距为400米，飞行离地高度为100米。为抑制数据中的长波长区域背景漂移，本次处理采用独立数据集——全澳航空地球物理调查（AWAGS）航空磁测数据，作为本次调查数据的基准控制依据。本调查数据已基本平差至AWAGS基准体系。