Julia Creek dose rate grid geodeticg

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 Julia Creek dose rate grid geodeticg has a cell size of 0.00083 degrees (approximately 90m) and shows the terrestrial dose rate of the Julia Creek, QLD, 1999. The data used to produce this grid was acquired in 1999 by the QLD Government, and consisted of 49397 line-kilometres of data at 400m line spacing and 80m terrain clearance.

辐射测量法（radiometric method），或称伽马能谱法（gamma-ray spectrometric method），用于测量地球表面附近探测到的伽马射线的自然变化，这些变化源于钾（K）、铀（U）和钍（Th）的天然放射性衰变。所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用途要求。地面剂量率网格（terrestrial dose rate grid）是通过滤波后的钾（K）、铀（U）和钍（Th）网格线性组合得到的。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Julia Creek大地测量剂量率网格（geodetic dose rate grid）的单元格大小为0.00083度（约90米），展示了1999年昆士兰州（QLD）Julia Creek地区的地面剂量率。生成该网格所用的数据由昆士兰州政府（QLD Government）于1999年采集，包含49397线公里的数据，线间距为400米，地形净空高度为80米。