Carpentaria Basin (Holroyd, Ebagoola, Cape Melville), QLD, 1973 (P402), 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 Carpentaria Basin (Holroyd, Ebagoola, Cape Melville), QLD, 1973 (P402), radiometric line data, AWAGS levelled were acquired in 1973 by the QLD Government, and consisted of 24969 line-kilometres of data at 3000m line spacing and 150m 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），又称伽马射线能谱法（gamma-ray spectrometric method），通过探测地球表面附近因钾（K）、铀（U）和钍（Th）的天然放射性衰变产生的伽马射线自然变化，量化相关辐射信号。所采集的数据将通过标准流程处理，确保记录到的辐射响应仅由地下岩石产生。经处理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，确保GA发布的最终数据符合使用要求。
本次数据集为1973年由昆士兰州（QLD）政府采集的卡奔塔利亚盆地（含霍尔罗伊德、埃巴古拉、梅尔维尔角区域）伽马射线能谱测线数据（编号P402），经澳大利亚全域航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）平差校正。该数据集总测线长度达24969线公里，测线间距为3000米，飞行离地净空高度为150米。为抑制数据中的长波长分量，研究人员采用AWAGS航空磁测数据作为独立数据集，对本次调查数据的基准水平进行校正，本次测线数据最终基本按AWAGS标准完成平差。