Canning Basin (Yampi, Pender, Broome) WA, Magnetic 1988/89 (P537), 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 Canning Basin (Yampi, Pender, Broome) WA, Magnetic 1988/89 (P537), radiometric line data, AWAGS levelled were acquired in 1989 by the WA Government, and consisted of 27060 line-kilometres of data at 1500m 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.

放射性能谱法（radiometric method，亦称伽马射线能谱法）通过测量地球表面附近检测到的伽马射线自然变化，表征由钾（K）、铀（U）及钍（Th）天然放射性衰变所引发的辐射响应。所采集的数据将通过标准化流程进行处理，以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，用以揭示地下地质构造特征。经处理后的数据将由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。本次数据集涵盖西澳大利亚州（WA）坎宁盆地（扬皮、彭德、布鲁姆区域）1988/1989年度磁测（编号P537）数据，以及经澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）平差的放射性测线数据，由西澳政府于1989年采集完成，总测线长度达27060测线公里，测线间距为1500米，飞行离地高度为150米。为约束数据中的长波长信号，本次调查采用独立数据集——澳大利亚全国航空地球物理调查（AWAGS）的航空磁测数据，对本次测线数据的基准面进行校正。本调查数据最终已基本平差至AWAGS基准。