Macdonald (Jolly Peaks) total count 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 Macdonald (Jolly Peaks) total count grid geodetic has a cell size of 0.00083 degrees (approximately 89m) and shows the terrestrial dose rate of the Macdonald (Jolly Peaks), WA, 1993. The data used to produce this grid was acquired in 1993 by the WA Government, and consisted of 76950 line-kilometres of data at 400m line spacing and 60m terrain clearance.

辐射测量法（radiometric method）或伽马射线能谱法（gamma-ray spectrometric method）可检测近地表伽马射线的自然变化，此类射线源于钾（Potassium, K）、铀（Uranium, U）及钍（Thorium, Th）的天然放射性衰变。所采集的数据将采用标准流程进行处理，以确保记录的响应仅源自地下岩石的放射性作用。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地球物理学家进行质量核查，以确保GA发布的最终数据符合使用要求。地表剂量率网格（terrestrial dose rate grid）通过过滤后的钾、铀、钍网格的线性组合生成，随后对该网格施加低通滤波器（low pass filter），得到过滤后的地表剂量率网格。本麦克唐纳（乔利峰）总计数大地测量网格的单元格尺寸为0.00083度（约89米），展示了1993年西澳大利亚州（Western Australia, WA）麦克唐纳（乔利峰）区域的地表剂量率。本网格的制作数据由西澳大利亚州政府于1993年采集，涵盖76950线公里的航测数据，航测线间距为400米，地形离地高度为60米。