Georgina NW, NT, 2002 (P1022), 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 Georgina NW, NT, 2002 (P1022), radiometric line data, AWAGS levelled were acquired in 2002 by the NT Government, and consisted of 108159 line-kilometres of data at 400m line spacing and 80m 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），通过检测地表附近的伽马射线自然变化，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化流程进行处理，以确保记录到的响应仅源自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需求。
本次数据集为2002年由北领地（NT, Northern Territory）政府采集的伽马射线测线数据，采集区域为北领地乔治娜西北部，编号P1022，经澳大利亚全国航空地球物理调查（AWAGS, Australia-wide Airborne Geophysical Survey）平差校正，总测线长度达108159千米，测线布设间距为400米，飞行离地高度为80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）航空磁测数据——来校准测线数据的基准电平。本测线数据本质上已完成针对AWAGS基准的平差校正。