Helen Springs - Brunchilly, NT, 1993 (P611), 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 Helen Springs - Brunchilly, NT, 1993 (P611), radiometric line data, AWAGS levelled were acquired in 1993 by the NT Government, and consisted of 117753 line-kilometres of data at a line spacing between 300m and 500m, 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.

放射性测量法（radiometric，即伽马射线能谱法）可探测地球表面附近的伽马射线自然变化，该变化源于钾（K）、铀（U）与钍（Th）的天然放射性衰变。所采集的数据将通过标准化流程处理，以确保记录的测量响应仅来自地下岩石。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查，确保GA发布的最终数据符合使用要求。
本次数据集为1993年由北领地（NT）政府采集的澳大利亚北领地海伦斯普林斯-布兰奇利（Helen Springs - Brunchilly）区域编号P611的伽马射线测线数据，经全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）校正平差。该数据集总测线长度达117753线公里，测线间距介于300米至500米之间，飞行地形离地高度为100米。为约束数据中的长波长分量，研究人员采用独立数据集——AWAGS航空磁测数据，对本次调查数据的基准水平进行校正管控。本次调查数据已基本校正平差至AWAGS基准。