GSWA Paterson Central ppm thorium 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.This radiometric thorium grid has a cell size of 0.00083 degrees (approximately 89m) and shows thorium element concentration of the Paterson Central, WA, 2005 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2005 by the WA Government, and consisted of 94391 line-kilometres of data at 400m line spacing and 60m terrain clearance.

放射性测量法（radiometric method），或称伽马射线光谱法（gamma-ray spectrometric method），用于检测地球表面附近伽马射线的自然变化，这些变化由钾（K）、铀（U）和钍（Th）的自然放射性衰变引起。采集的数据通过标准方法处理，确保记录的响应仅来源于地下岩石。处理结果生成的数据集可经解释揭示地下地质结构。GA的地球物理学家会对处理后的数据进行质量检查，以保证GA发布的最终数据符合预期用途。

该放射性钍网格的单元格大小为0.00083度（约89米），以百万分之一（ppm）为单位展示了2005年西澳大利亚州（WA）帕特森中部地区的钍元素浓度。