Broken Hill (Regional), NSW, 1975 (P420), 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 Broken Hill (Regional), NSW, 1975 (P420), radiometric line data, AWAGS levelled were acquired in 1975 by the NSW Government, and consisted of 13485 line-kilometres of data at 1500m 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.

放射性测量法（radiometric method，亦称伽马射线能谱法）通过探测地表附近的伽马射线自然变化，来反映钾（K）、铀（U）和钍（Th）的自然放射性衰变产生的辐射信号。所获数据将通过标准流程开展处理，以确保记录到的信号仅源于地下岩石。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发布的最终数据满足使用需求。本次数据集为经澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）校正的放射性测线数据，采集于1975年的新南威尔士州布罗肯希尔（区域）（编号P420），由新南威尔士州政府完成采集，数据总长13485测线公里，测线间距1500米，地形离地高度100米。为约束数据中的长波分量，研究人员采用了独立数据集——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水平进行校正。本次测线数据实质上已按AWAGS标准完成电平校正。