NETGOLD - Mathinna, Tas , 1990 (P782), 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 NETGOLD - Mathinna, Tas , 1990 (P782), radiometric line data, AWAGS levelled were acquired in 1990 by the TAS Government, and consisted of 1680 line-kilometres of data at 150m 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），亦称伽马能谱法（gamma-ray spectrometric method），可通过探测地表附近的伽马射线自然变化，获取由钾（K）、铀（U）和钍（Th）天然放射性衰变产生的信号。所采集的数据将通过标准流程处理，确保记录到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，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验，以确保GA发布的最终数据符合使用需求。

本次数据集为NETGOLD-塔斯马尼亚州马廷纳（Mathinna）1990年（P782）经AWAGS基准平差的伽马能谱测线数据，由塔斯马尼亚州政府（TAS Government）于1990年采集完成，总测线长度达1680线公里，测线间距150米，飞行离地高度80米。为约束数据中的长波长分量，研究人员采用独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次测线数据的基准水平进行校正。本次测线数据实质上已完成AWAGS基准平差。