Radiometric Grid of Australia (Radmap) v4 2019 ratio uranium squared over thorium

The uranium squared over thorium grid is a derivative of the 2019 radiometric or gamma-ray grid of Australia. 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 are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector.The 2019 uranium squared over thorium was derived by seamlessly merging over 600 airborne gamma-ray spectrometric surveys. The final grid has a cell size of about 100m (0.001 degrees) and is derived from the filtered uranium and thorium grids.

铀平方与钍比值网格（uranium squared over thorium grid）衍生自2019年澳大利亚放射性能谱或伽马射线网格数据集。放射性能谱法（又称伽马射线能谱法）通过测量地球表面附近探测到的伽马射线自然变化量，该变化源于钾（K）、铀（U）与钍（Th）的天然放射性衰变。本数据集由英联邦、澳大利亚各州及北领地政府与私营部门开展的航空地球物理调查采集获取。2019年版铀平方与钍比值网格通过无缝融合超600组航空伽马射线能谱调查数据生成。最终网格的单元格尺寸约为100米（0.001度），由经过滤波处理的铀网格与钍网格计算得到。