GSSA Murloocoppie 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 GSSA Murloocoppie Dose Rate Grid Geodetic has a cell size of 0.00042 degrees (approximately 44m) and shows the terrestrial dose rate of the Murloocoppie Airborne Magnetic Radiometric and DEM Survey, SA, 2016. The data used to produce this grid was acquired in 2017 by the SA Government, and consisted of 109753 line-kilometres of data at 200m line spacing and 60m terrain clearance.

辐射测量法（或称伽马射线能谱法）通过探测地球表面附近的伽马射线自然变化，获取由钾（K）、铀（U）及钍（Th）天然放射性衰变所产生的信号。所采集的数据将通过标准流程进行处理，确保记录的响应仅来源于地下岩石。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校验，确保GA发布的最终数据符合使用需求。
地面剂量率网格通过对滤波后的钾、铀、钍网格进行线性组合得到，随后对该网格应用低通滤波器，生成滤波后的地面剂量率网格。
本GSSA Murloocoppie大地测量剂量率网格的像元尺寸为0.00042度（约44米），展示了2016年南澳大利亚州Murloocoppie航空磁辐射测量与数字高程模型（Digital Elevation Model，DEM）调查的地面剂量率分布。生成该网格所用的数据由南澳大利亚州政府于2017年采集，数据覆盖109753线公里，测线间距为200米，地形离地高度为60米。