5028 Block 1 (Southwest) Grid of thorium ground concentration with NASVD and standard reductions applied

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 degrees (approximately 20m) and shows thorium element concentration of the Narryer in units of parts per million (or ppm). The data used to produce this grid was acquired in 2024 by the WA Government, and consisted of 415090 line-kilometres of data at 100m line spacing and 50m terrain clearance.辐射测量法（radiometric，又称伽马能谱法）通过采集地表附近的伽马射线自然变化，以反映钾（K）、铀（U）及钍（Th）的天然放射性衰变所产生的辐射信号。所采集的数据将通过标准流程进行处理，以确保记录的辐射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。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。 该辐射测量钍格网的像元尺寸为度（约20米），呈现了纳里耶（Narryer）区域的钍元素浓度，单位为百万分比（parts per million，简称ppm）。用于生成该格网的数据由西澳大利亚州政府（WA Government）于2024年采集，总测线覆盖长度达415090线公里，测线间距为100米，地形离地高度为50米。