Flinders Island, Tasmania, 2007 (P1142), 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 Flinders Island, Tasmania, 2007 (P1142), radiometric line data, AWAGS levelled were acquired in 2007 by the TAS Government, and consisted of 18426 line-kilometres of data at 200m line spacing and 90m 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.

放射性伽马能谱测量法（又称伽马射线能谱法）通过探测地球表面附近的伽马射线自然变化，表征钾（K）、铀（U）及钍（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，以确保记录的响应仅源于地下岩石的辐射。经处理得到的数据集可用于解译，以揭示地下地质构造。GA的地球物理学家会对处理后的数据开展质量检查，确保GA发布的最终数据符合使用要求。本数据集为2007年塔斯马尼亚州弗林德斯岛（P1142）的放射性航测线数据，经全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey，AWAGS）基准校正，由塔斯马尼亚州政府（TAS Government）于2007年采集完成，数据总长18426测线公里，测线间距200米，飞行地形离地高度90米。为抑制数据中的长波长信号，本数据集采用独立数据集——全澳航空地球物理调查（AWAGS）航磁数据——对本次测量数据的基线水平进行校正。本次测量数据最终已完成AWAGS基准校正。