Barrow Island, WA, 1985 (P511), radiometric line data

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 Barrow Island, WA, 1985 (P511), radiometric line data were acquired in 1985 by the WA Government, and consisted of 1524 line-kilometres of data at 1000m line spacing and 100m terrain clearance.

放射性测量法，又称伽马射线能谱法，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）及钍（Th）的自然放射性衰变。所采集的数据将通过标准流程处理，以确保记录的响应仅源于地下岩石。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开展质量核查，以确保GA发布的最终数据符合使用要求。本次西澳大利亚州（Western Australia）巴罗岛1985年（P511）放射性测线数据由西澳大利亚州政府于1985年采集完成，数据总长度达1524测线公里，测线间距为1000米，地形离地高度为100米。