Southern Cross, WA, 1995-96 (Fugro) (P1051), 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 Southern Cross, WA, 1995-96 (Fugro) (P1051), radiometric line data, AWAGS levelled were acquired in 1995 by the WA Government, and consisted of 42693 line-kilometres of data at 100m line spacing and 50m 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，又称伽马能谱法（radiometric, or gamma-ray spectrometric method），通过探测地表附近的伽马射线自然变化获取数据，该信号源于钾（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进行处理，以确保记录的辐射响应仅由地下岩石产生。处理后得到的数据集可通过解译揭示地下地质构造。GA地球物理学家会对处理后的数据进行质量核查，以确保GA发布的最终数据符合使用要求。本次数据集为西澳大利亚州政府（WA Government）于1995年采集的编号为P1051的富格罗公司（Fugro）1995-1996年西澳南部十字区（Southern Cross, WA）放射性测线数据，该数据已完成澳大利亚全域航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）水准校正。本次测线总长42693线公里，线间距为100米，地形离地高度为50米。为约束数据中的长波长信号，本次调查采用AWAGS航空磁测数据作为独立数据集，用于校正本次测线数据的基准水平。本次调查数据已基本完成AWAGS水准校正。