Robert, WA, 1991 (P723), 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 Robert, WA, 1991 (P723), radiometric line data, AWAGS levelled were acquired in 1991 by the WA Government, and consisted of 81842 line-kilometres of data at 300m line spacing and 60m 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，亦称伽马射线能谱法）通过检测地球表层附近的伽马射线自然波动，表征由钾（K）、铀（U）及钍（Th）的自然放射性衰变所产生的辐射响应。所采集的数据将通过标准流程进行预处理，以确保记录到的辐射响应仅源自地下岩体。经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查，以确保GA发布的最终数据符合使用需求。本次数据集为1991年由西澳大利亚州政府采集的、编号为P723的西澳大利亚州罗伯特地区放射性测线数据，该数据已通过全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）完成平差，总测线里程达81842线公里，测线间距为300米，航空作业离地高度为60米。为约束数据中的长波长分量，本次调查采用独立数据集——全澳航空地球物理调查（AWAGS）航空磁测数据，对本次测线数据的基准水平进行控制。本次调查数据本质上已基于AWAGS完成平差。