Delamere, NT, 2015 (P1274), 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 Delamere, NT, 2015 (P1274), radiometric line data, AWAGS levelled were acquired in 2015 by the NT Government, and consisted of 96790 line-kilometres of data at 400m 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.

辐射测量法，又称伽马射线能谱法，通过探测地表附近的伽马射线自然变化，表征钾（K）、铀（U）与钍（Th）发生天然放射性衰变所产生的信号。所采集的数据将通过标准化流程开展预处理，确保记录到的伽马射线响应仅由地下岩石的放射性衰变产生。经处理得到的数据集可通过地质解译，揭示地下地质构造特征。GA的地球物理学家将对处理后的数据开展质量核验，确保GA对外发布的最终数据满足使用需求。本次为北领地（NT）2015年（项目编号P1274）的辐射测量剖面数据，经澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey，简称AWAGS）校正整平，由北领地政府于2015年采集完成，总测线里程达96790测线公里，测线间距为400米，飞行离地高度为80米。为压制数据中的长波长干扰成分，本次调查引入独立数据集——澳大利亚全国航空地球物理调查（AWAGS）航空磁测数据，对本次测线数据的基准值开展校正控制。本次调查数据已基本完成AWAGS基准整平校正。