South Lake Woods, NT, 1999 (P1009), 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 South Lake Woods, NT, 1999 (P1009), radiometric line data, AWAGS levelled were acquired in 1999 by the NT Government, and consisted of 45341 line-kilometres of data at 400m 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.

放射性测量法（radiometric method），亦称伽马射线能谱法（gamma-ray spectrometric method），可通过检测地表附近的伽马射线自然变化量，反映钾（K）、铀（U）与钍（Th）的天然放射性衰变所产生的辐射信号。所采集的数据将通过标准流程进行处理，以确保记录到的响应仅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。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。1999年由北领地政府采集的北领地（NT）南莱克伍兹（South Lake Woods）测线放射性测量数据（编号P1009）已完成AWAGS水准校正，总测线里程达45341线公里，测线间距为400米，飞行离地高度为60米。为压制数据中的长波长噪声，本次调查采用独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对测线数据的基准电平进行校正。本测线数据已基本完成基于AWAGS的水准校正。