MRTAS Flinders Island doserate 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. The terrestrial dose rate grid is derived as a linear combination of the filtered K, U and Th grids. A low pass filter is applied to this grid to generate the filtered terrestrial dose rate grid.This MRTAS Flinders Island doserate grid geodetic has a cell size of 0.00042 degrees (approximately 41m) and shows the terrestrial dose rate of the Flinders Island, Tasmania, 2007. The data used to produce this grid was acquired in 2007 by the TAS Government, and consisted of 18426 line-kilometres of data at 200m line spacing and 90m terrain clearance.

放射测量法（radiometric method，或称伽马射线能谱法（gamma-ray spectrometric method））通过探测地球表面附近的伽马射线自然变化，对钾（K）、铀（U）及钍（Th）的天然放射性衰变所产生的辐射信号进行测量。所采集的数据将通过标准化流程进行处理，以确保记录的响应仅源于地下岩石的辐射。经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查，以确保GA发布的最终数据符合使用需求。地表剂量率网格通过经滤波的钾、铀、钍网格的线性组合生成，随后对该网格施加低通滤波，得到滤波后的地表剂量率网格。本MRTAS弗林德斯岛大地测量剂量率网格的单元格大小为0.00042度（约41米），展示了2007年塔斯马尼亚州弗林德斯岛的地表剂量率分布。用于生成该网格的数据由塔斯马尼亚州政府于2007年采集，涵盖18426线公里的航测数据，航测线间距为200米，地形离地高度为90米。