Helen Springs - Buloomungroo, 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 - Buloomungroo, 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.

放射测量法 (radiometric method)，又称伽马能谱法 (gamma-ray spectrometric method)，通过探测地球表面附近的伽马射线自然变化量开展测量，该变化源自钾（K）、铀（U）及钍（Th）的自然放射性衰变。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源于地下岩石。处理后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。本次数据集为北领地（NT）政府于1993年采集的海伦斯普林斯-布卢蒙格罗（Helen Springs - Buloomungroo）区域放射测量航线数据（编号P611），该数据已完成澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey，简称AWAGS）水准校正。数据集总航线长度达117753测线公里，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，本次处理采用了独立数据集——澳大利亚全国航空地球物理调查（AWAGS）航空磁测数据，以管控调查数据的基准水平。本调查数据已基本完成AWAGS水准校正。