Murray Basin (Booligal), NSW, 1981 (P466), 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 Murray Basin (Booligal), NSW, 1981 (P466), radiometric line data, AWAGS levelled were acquired in 1981 by the NSW Government, and consisted of 9144 line-kilometres of data at 3000m 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，又称伽马能谱法）通过探测地球表面附近的伽马射线，测定由钾（K）、铀（U）和钍（Th）的天然放射性衰变所引发的自然伽马射线变化。采集所得的数据将通过标准处理流程进行校正与净化，以确保记录的响应仅来源于地下岩石。经处理得到的数据集可通过地质解译，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查，确保GA发布的最终数据满足使用要求。本次数据集为1981年新南威尔士州（New South Wales, NSW）墨累盆地（Booligal，博利加尔）P466号经澳大利亚全国航空地球物理调查（Airborne Geophysical Survey, AWAGS）基准校正的放射性测量测线数据，由新南威尔士州政府完成采集，涵盖9144线公里的测线数据，测线间距为3000米，地形离地高度为150米。为约束数据中的长波长分量，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（Airborne Geophysical Survey, AWAGS）航空磁测数据，以控制本次调查数据的基准面。本次调查数据实质上已完成AWAGS基准校正。