Tennant Creek, NT, 1998 (P694), 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 Tennant Creek, NT, 1998 (P694), radiometric line data, AWAGS levelled were acquired in 1998 by the NT Government, and consisted of 98200 line-kilometres of data at 200m line spacing and 60m 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.

辐射测量法（radiometric method，亦称伽马射线能谱法）通过探测地表附近的伽马射线，量化钾（K）、铀（U）及钍（Th）自然放射性衰变所产生的伽马射线自然变化。所采集的数据将通过标准化流程处理，确保记录的响应仅来源于地下岩石的放射性衰变。经处理得到的数据集可通过解译，揭示地下地质构造特征。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发布的最终数据符合使用要求。本次采集于1998年的北领地（NT）坦南特克里克辐射测量航线数据（编号P694）经AWAGS基准校正，由北领地政府完成采集，总数据量达98200航线公里，航线间距为200米，飞行离地高度为60米。为校正数据中的长波长分量，本次研究采用独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次调查数据的基准水平进行校正。本次调查数据本质上已完成AWAGS基准校正。