Batemans Bay-Narooma, NSW, 1998 (P746), 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 Batemans Bay-Narooma, NSW, 1998 (P746), radiometric line data, AWAGS levelled were acquired in 1998 by the NSW Government, and consisted of 7792 line-kilometres of data at 250m line spacing and 60m 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（radiometric, or gamma-ray spectrometric method）通过检测地球表面附近的伽马射线自然变化开展测量，此类伽马射线源自钾（K）、铀（U）与钍（Th）的自然放射性衰变。采集所得数据将通过标准处理流程进行处理，确保记录的响应仅源于地下岩石。经处理后得到的数据集可用于解译，以揭示地下地质构造。处理后的数据由GA地球物理学家开展质量核查，确保GA发布的最终数据符合使用要求。本次数据集为新南威尔士州贝特曼斯湾-纳鲁马地区1998年（P746）辐射测量测线数据，经AWAGS基准平差。该数据由新南威尔士州政府于1998年采集，总测线长度达7792公里，测线间距为250米，地形离地高度为60米。为约束数据中的长波长分量，研究采用澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey，简称AWAGS）的航空磁测数据作为独立数据集，对本次调查数据的基准面进行控制。本次调查数据已基本以AWAGS为基准完成平差。