Daly, NT, 1979 (P1102), 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 Daly, NT, 1979 (P1102), radiometric line data, AWAGS levelled were acquired in 1979 by the NT Government, and consisted of 31521 line-kilometres of data at 300m 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））可检测地球表面附近天然伽马射线的自然变化，这类射线源于钾（K）、铀（U）与钍（Th）的天然放射性衰变。所采集的数据将经标准流程处理，以确保记录到的响应仅源于地下岩石。最终生成的数据集可通过解译，用以揭示地下地质构造。经处理的数据将由GA地球物理学家开展质量核查，以确保GA发布的最终数据符合使用需求。本次编号为P1102的1979年北领地（NT）戴利（Daly）地区经AWAGS校正的放射性测线数据，由北领地政府于1979年采集完成，数据总长31521线公里，测线间距300米，飞行离地高度80米。为抑制数据中的长波长成分，本次调查采用独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——来校正测线数据的基准值。本次测线数据已基本校正至AWAGS基准。