Petermann East, NT, 1987 (P545), 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 Petermann East, NT, 1987 (P545), radiometric line data, AWAGS levelled were acquired in 1987 by the NT Government, and consisted of 20179 line-kilometres of data at 500m 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.

放射测量法，即伽马射线能谱法（gamma-ray spectrometric method），可检测地表附近伽马射线的自然波动，此类伽马射线源自钾（K）、铀（U）及钍（Th）的天然放射性衰变。采集所得数据将通过标准流程处理，以确保记录的辐射响应仅源于地下岩石。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验，以确保GA发布的最终数据符合使用要求。1987年由北领地（Northern Territory，简称NT）政府采集的东彼特曼（Petermann East）P545号放射测量测线数据，经澳大利亚全域航空地球物理调查（Australia-wide Airborne Geophysical Survey，简称AWAGS）平差处理，总测线长度达20179线千米，测线间距为500米，地形离地高度为100米。为抑制数据中的长波长信号，研究人员采用独立数据集——AWAGS航空磁测数据——对本次测线数据的基准水平进行校正。本次测线数据本质上已基于AWAGS数据集完成平差校正。