Tanami East, NT, 1987 (P530), 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 Tanami East, NT, 1987 (P530), radiometric line data, AWAGS levelled were acquired in 1987 by the NT Government, and consisted of 14260 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.

放射性测量法（radiometric method），亦称伽马能谱法（gamma-ray spectrometric method），通过探测地球表面附近的伽马射线自然变化，表征由钾（K）、铀（U）及钍（Th）的天然放射性衰变所产生的伽马射线信号。所采集的数据将通过标准流程进行处理，以确保记录的响应仅由地下岩石的放射性衰变产生。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。本次东塔纳米（Tanami East）北领地（Northern Territory，NT）地区的伽马能谱测线数据（编号P530，1987年采集，已针对全国航空地球物理调查（Australia-wide Airborne Geophysical Survey，AWAGS）完成平差处理），由北领地政府于1987年采集，总测线长度达14260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趋势，研究人员采用独立数据集——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面进行校正。本次测线数据实质上已针对AWAGS完成平差校正。