GSWA Widgiemooltha South Doserate 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 GSWA Widgiemooltha South Doserate Grid Geodetic has a cell size of 0.00021 degrees (approximately 21m) and shows the terrestrial dose rate of the Widgiemooltha South, WA, 2012. The data used to produce this grid was acquired in 2012 by the WA Government, and consisted of 131391 line-kilometres of data at 100m line spacing and 50m terrain clearance.

辐射测量法（Radiometric Method），亦称伽马能谱法（Gamma-ray Spectrometric Method），可检测地球表面附近探测到的伽马射线的自然变化，这类射线源自钾（K）、铀（U）和钍（Th）的天然放射性衰变。所采集的数据将通过标准流程处理，以确保记录的响应仅由地下岩石的放射性辐射产生。处理后得到的数据集可用于解译，以揭示地下地质构造。GA地球物理学家会对处理后的数据开展质量核查，以确保GA发布的最终数据符合使用要求。地表剂量率网格通过滤波后的钾、铀、钍网格的线性组合生成。对该网格应用低通滤波器后，可生成滤波后的地表剂量率网格。本GSWA Widgiemooltha South Doserate Grid Geodetic数据集的网格单元尺寸为0.00021度（约21米），展示了2012年西澳大利亚州（WA）威杰穆尔塔南部区域的地表剂量率分布情况。该网格的制作数据由西澳政府（WA Government）于2012年采集，总测线长度达131391线公里，测线间距为100米，地形离地高度为50米。