NTGS SpiritHills 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 0.00083 degrees (approximately 91m) and shows thorium element concentration of the NTGS Delamere and Spirit Hills, NT, 2015 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2015 by the NT Government, and consisted of 96790 line-kilometres of data at 400m line spacing and 80m terrain clearance.放射性测量法（radiometric method，又称伽马射线能谱法）可检测近地表伽马射线的自然变化，该变化源自钾（K）、铀（U）以及钍（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，以确保记录的响应仅源于地下岩石。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。本次的放射性钍格网（radiometric thorium grid）单元尺寸为0.00083度（约91米），展示了2015年澳大利亚北领地（NT）北领地地质调查局（NTGS）德拉米尔与精神山区域的钍元素浓度，单位为百万分之一（ppm）。用于生成该格网的数据由北领地政府于2015年采集，总数据覆盖长度达96790线公里，测线间距为400米，飞行离地高度为80米。