North Central Tasmania, Tas, 1999 (P699), 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 North Central Tasmania, Tas, 1999 (P699), radiometric line data, AWAGS levelled were acquired in 1999 by the TAS Government, and consisted of 39404 line-kilometres of data at 200m 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，又称伽马能谱法（gamma-ray spectrometric method））通过探测地表附近的伽马射线自然变化，量化由钾（K）、铀（U）和钍（Th）的自然放射性衰变所引发的辐射响应。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放射性衰变。经处理得到的数据集可通过解译，用以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检查，以确保GA发布的最终数据符合使用要求。本次数据集为1999年采集的塔斯马尼亚州中北部放射性测线数据（编号P699），经澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）校准，由塔斯马尼亚州政府（TAS Government）完成采集，总测线长度达39404线公里，测线间距为200米，飞行离地高度为80米。为抑制数据中的长波长信号，研究人员采用独立数据集——澳大利亚全国航空地球物理调查（AWAGS）航空磁测数据——对本次调查数据的基准水平进行校正。本次调查数据已基本校准至AWAGS标准。