GSQ Isa Georgetown Block B Qld 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 GSQ Isa Georgetown Block B Qld dose rate grid geodetic has a cell size of 0.00048 degrees (approximately 52m) and shows the terrestrial dose rate of the Isa-Georgetown Block B, QLD, 2000, Prospectivity Plus Initiative. The data used to produce this grid was acquired in 2000 by the QLD Government, and consisted of 42035 line-kilometres of data at a line spacing between 200m and 400m, and 80m terrain clearance.

辐射测量法（radiometric method，又称伽马射线光谱法）通过检测地球表面附近的伽马射线自然变化，来测量钾（K）、铀（U）和钍（Th）的自然放射性衰变结果。采集的数据通过标准方法处理，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用于解析，以揭示地下地质结构。GA的地球物理学家会对处理后的数据进行质量检查，确保GA发布的最终数据符合预期用途。地面剂量率网格（terrestrial dose rate grid）是通过对滤波后的K、U和Th网格进行线性组合得到的。对该网格应用低通滤波器（low pass filter），生成滤波后的地面剂量率网格。

这个GSQ的伊萨-乔治敦B区块（QLD）大地测量剂量率网格的单元格大小为0.00048度（约52米），展示了2000年QLD伊萨-乔治敦B区块“勘探潜力增强计划（Prospectivity Plus Initiative）”的地面剂量率。生成该网格所用的数据由QLD政府于2000年采集，包含42035线公里（line-kilometres）的数据，线间距（line spacing）在200米至400米之间，地形净空高度（terrain clearance）为80米。