Mt Elizabeth totalcount 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. 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 Mt Elizabeth totalcount grid has a cell size of 0.00083 degrees (approximately 91m) and shows the terrestrial dose rate of the Mt Elizabeth, WA,1993. The data used to produce this grid was acquired in 1993 by the WA Government, and consisted of 50696 line-kilometres of data at 400m line spacing and 60m terrain clearance.

辐射测量法（radiometric method），又称伽马射线能谱法（gamma-ray spectrometric method），通过探测地球表面附近伽马射线的自然变化，来测量钾（K）、铀（U）和钍（Th）自然放射性衰变产生的信号。采集的数据经标准方法处理，确保记录的响应仅源于地下岩石。处理结果生成的数据集可用于解译地下地质结构。GA的地球物理学家对处理后的数据进行质量核查，以保证GA发布的最终数据满足使用需求。地面剂量率网格（terrestrial dose rate grid）由滤波后的K、U、Th网格线性组合而成。对该网格施加低通滤波器（low pass filter），即可生成滤波后的地面剂量率网格。

此伊丽莎白山（Mt Elizabeth）总计数网格（totalcount grid）的单元格大小为0.00083度（约91米），展示了1993年西澳大利亚州（WA）伊丽莎白山地区的地面剂量率。生成该网格的数据由西澳大利亚州政府于1993年采集，包含50696测线公里（line-kilometres）的数据，测线间距为400米，地形净空高度（terrain clearance）为60米。