SWCC P1177 Dumbleyung detailed dose rate 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 SWCC P1177 Dumbleyung detailed dose rate grid geodetic has a cell size of 0.00021 degrees (approximately 21m) and shows the terrestrial dose rate of the Dumbleyung (SWCC), WA, 2008. The data used to produce this grid was acquired in 2008 by the WA Government, and consisted of 75805 line-kilometres of data at a line spacing between 100m and 400m, and 60m terrain clearance.

放射性测量法（radiometric method），或称伽马能谱法（gamma-ray spectrometric method），通过测量地球表面附近探测到的伽马射线的自然变化来研究钾（K）、铀（U）和钍（Th）的自然放射性衰变。采集的数据通过标准方法进行处理，以确保记录的响应仅来源于地下岩石。处理结果生成的数据集可通过解译揭示地下地质结构。处理后的数据由GA地球物理学家进行质量检查，以确保GA发布的最终数据符合使用要求。地面剂量率网格（terrestrial dose rate grid）由经过滤波的K、U和Th网格线性组合得到。对该网格应用低通滤波器（low pass filter）以生成滤波后的地面剂量率网格。

该SWCC P1177 Dumbleyung大地测量详细剂量率网格的单元格大小为0.00021度（约21米），展示了2008年西澳大利亚州（WA）Dumbleyung地区（SWCC）的地面剂量率。生成该网格所用的数据由西澳大利亚州政府于2008年采集，包含75805测线公里的数据，线间距为100米至400米，地形净空高度为60米。