Bangemall Basin thorium grid geodetic

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 radiometric thorium grid has a cell size of 0.001 degrees (approximately 106m) and shows thorium element concentration of the Bangemall Basin, WA, 1995 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1995 by the WA Government, and consisted of 144720 line-kilometres of data at 500m line spacing and 60m terrain clearance.

放射测量法（radiometric method，即伽马射线能谱法（gamma-ray spectrometric method））可探测地表附近的伽马射线自然变化，该变化源于钾（K）、铀（U）和钍（Th）的天然放射性衰变。所采集的数据将通过标准流程处理，以确保记录到的仪器响应仅源于地下岩石的放射性衰变。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校验，以确保GA发布的最终数据符合使用要求。
该放射测量钍网格（radiometric thorium grid）的单元格分辨率为0.001度（约106米），展示了1995年西澳大利亚州（WA）班戈尔盆地（Bangemall Basin）的钍元素浓度分布，单位为百万分率（parts per million，简称ppm）。本网格所用数据由西澳大利亚州政府（WA Government）于1995年采集，涵盖总长度达144720线公里的测线数据，测线间距为500米，飞行离地高度为60米。