MRTAS Weymouth Cape Portland uranium 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 uranium grid has a cell size of 0.001 degrees (approximately 98m) and shows uranium element concentration of the NETGOLD - Weymouth-Cape Portland, TAS, 1993 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1993 by the TAS Government, and consisted of 4309 line-kilometres of data at 400m line spacing and 80m terrain clearance.

放射性测量法（radiometric method），又称伽马能谱法（gamma-ray spectrometric method），通过检测地球表面附近的伽马射线自然变化，来表征由钾（K）、铀（U）与钍（Th）发生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化流程进行处理，以确保记录的辐射响应仅来源于地下岩石。经处理得到的数据集可用于解译，以揭示地下地质构造。经处理的数据将由GA地球物理学家开展质量检查，以确保GA发布的最终数据符合使用要求。本次的铀元素放射性测量栅格数据像元尺寸为0.001度（约合98米），展示了1993年塔斯马尼亚州（TAS）NETGOLD项目——韦茅斯-波特兰角区域的铀元素浓度，单位为百万分比（parts per million，即ppm）。用于生成该栅格的数据由塔斯马尼亚州政府（TAS Government）于1993年采集，总测线长度达4309线千米，测线间距为400米，地形离地高度为80米。