GSSA Warrina Dose 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 GSSA Warrina Dose Grid Geodetic has a cell size of 0.00083 degrees (approximately 87m) and shows the terrestrial dose rate of the Marree-Warrina Airborne Magnetic & Radiometric Survey, SA, 2012. The data used to produce this grid was acquired in 2012 by the SA Government, and consisted of 132484 line-kilometres of data at 400m line spacing and 80m terrain clearance.

辐射测量法（radiometric），亦称伽马射线能谱法，可测量地球表面附近探测到的伽马射线的自然波动，此类射线源自钾（K）、铀（U）与钍（Th）的天然放射性衰变。所采集的数据将通过标准流程进行处理，以确保记录下的响应仅源于地下岩石。经处理后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地球物理学家开展质量核验，以确保GA发布的最终数据符合使用要求。地面剂量率栅格由经过滤波的钾、铀、钍栅格线性组合得到，随后对该栅格应用低通滤波器，生成滤波后的地面剂量率栅格。本GSSA沃里娜大地测量剂量栅格的像元大小为0.00083度（约87米），展示了2012年南澳大利亚州马瑞-沃里娜航空磁测与辐射测量普查的地面剂量率分布。用于生成该栅格的数据由南澳大利亚州政府于2012年采集，总测线长度达132484测线公里，测线间距为400米，飞行离地高度为80米。