The Granites Mt Solitaire Highland Rocks Mt Theo thorium grid

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 100m) and shows thorium element concentration of the The Granites, Mt Solitaire, Highland Rocks, Mt Theo, NT, 1993 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1993 by the NT Government, and consisted of 108984 line-kilometres of data at 500m line spacing and 90m terrain clearance.

放射性测量法（radiometric method，又称伽马射线能谱法（gamma-ray spectrometric method））以地球表面附近探测到的伽马射线自然变化为测量对象，此类变化源于钾（K）、铀（U）与钍（Th）的天然放射性衰变。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来自地下岩石。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核查，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100米），展示了1993年北领地（NT）境内The Granites、索利泰山（Mt Solitaire）、高地岩石区（Highland Rocks）与西奥山（Mt Theo）区域的钍元素浓度，单位为百万分比（ppm）。用于生成该网格的数据由北领地政府于1993年采集，数据总覆盖长度达108984线公里，测线间距为500米，地形离地高度为90米。