Parkes 1 100k total count 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 Parkes 1 100k total count grid geodetic has a cell size of 0.00042 degrees (approximately 43m) and shows the terrestrial dose rate of the Forbes Detail, NSW, 1993. The data used to produce this grid was acquired in 1993 by the NSW Government, and consisted of 49055 line-kilometres of data at a line spacing between 200m and 400m, and 100m terrain clearance.

辐射测量法（又称伽马能谱法）通过探测地球表面附近的伽马射线自然变化，表征钾（K）、铀（U）和钍（Th）的天然放射性衰变所产生的辐射信号。所采集的数据将通过标准化流程进行处理，以确保记录的辐射响应仅源于地下岩石。经处理得到的数据集可通过解译，揭示地下地质构造特征。经处理的数据将由GA地球物理学家开展质量校验，以确保GA发布的最终数据符合使用要求。地表剂量率网格由滤波后的钾、铀、钍网格经线性组合生成，随后对该网格应用低通滤波器，得到滤波后的地表剂量率网格。本帕克斯1号10万总计数大地测量网格的像元尺寸为0.00042度（约43米），展示了1993年新南威尔士州福布斯详细测区的地表剂量率分布。用于生成该网格的数据由新南威尔士州政府于1993年采集，总测线长度达49055线公里，测线间距介于200米至400米之间，采集离地高度为100米。