Dubbo Detail NSW 1991 (P569), 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 Dubbo Detail NSW 1991 (P569), radiometric line data, AWAGS levelled were acquired in 1991 by the NSW Government, and consisted of 63636 line-kilometres of data at a line spacing between 200m and 400m, 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.

放射性测量法（又称伽马射线能谱法）通过探测地球表面附近的伽马射线自然变化，来反映钾（K）、铀（U）与钍（Th）的自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化流程进行处理，以确保记录到的响应仅来自地下岩石的辐射。经处理得到的数据集可通过解译，揭示地下地质构造。处理后的数据将由GA地球物理学家开展质量核验，以确保GA发布的最终数据满足使用需求。本次数据集为1991年由新南威尔士州政府采集的《1991年新南威尔士州达博细节测线数据（P569）》，属于经澳大利亚全域航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）平差校正的放射性测线数据，总测线长度达63636测线公里，测线间距介于200米至400米之间，飞行离地高度为100米。为抑制数据中的长波长信号，本次调查采用独立数据集——澳大利亚全域航空地球物理调查航空磁测数据，对测线数据的基准面进行校正控制。本次测线数据本质上已统一校正至AWAGS的基准体系。