GSNSW P1253doseg

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 GSNSW P1253doseg has a cell size of 0.00026 degrees (approximately 26m) and shows the terrestrial dose rate of the Murrumbateman, NSW, 2010 Detailed Airborne Survey. The data used to produce this grid was acquired in 2010 by the NSW Government, and consisted of 1339 line-kilometres of data at 125m line spacing and 60m terrain clearance.

辐射测量法（Radiometric or Gamma-ray Spectrometric Method），亦称伽马射线能谱法，通过探测地球表面附近的伽马射线自然变化，以表征钾（K）、铀（U）和钍（Th）的天然放射性衰变所产生的辐射响应。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需求。地表剂量率网格（Terrestrial Dose Rate Grid）通过滤波后的钾、铀、钍网格的线性组合生成，随后对该网格应用低通滤波器（Low Pass Filter），得到滤波后的地表剂量率网格。本GSNSW P1253doseg数据集的像元大小为0.00026度（约26米），展示了2010年新南威尔士州穆伦比德曼（Murrumbateman）详细航空测量的地表剂量率分布。用于生成该网格的数据由新南威尔士州政府于2010年采集，总测线长度达1339线公里，测线间距为125米，飞行离地高度为60米。