Medusa Banks Port Keats 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 109m) and shows thorium element concentration of the Medusa Banks, Port Keats, WA, 1994 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1994 by the WA Government, and consisted of 68378 line-kilometres of data at 500m line spacing and 100m terrain clearance.

放射性测量法，亦称伽马射线能谱法，通过采集地球表面附近的伽马射线自然变化量，来表征由钾（K）、铀（U）和钍（Th）天然放射性衰变所引发的辐射响应。所采集的数据将通过标准化流程处理，以确保记录的响应仅源自地下岩石的辐射。经处理得到的数据集可通过解译揭示地下地质构造特征。经处理的数据将由GA地球物理学家开展质量核验，以确保GA发布的最终数据符合使用要求。
本放射性钍数据网格的栅格单元尺寸为0.001度（约合109米），展示了1994年西澳大利亚州（WA）基茨港（Port Keats）美杜莎浅滩（Medusa Banks）区域的钍元素浓度，单位为百万分率（ppm）。用于生成该网格的原始数据由西澳大利亚州政府于1994年采集，总测线长度达68378千米，测线间距为500米，飞行离地高度为100米。