GSWA P1177 Kukerin ppmth 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 85m) and shows thorium element concentration of the Dumbleyung (SWCC), WA, 2008 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2008 by the WA Government, and consisted of 75805 line-kilometres of data at a line spacing between 100m and 400m, and 60m terrain clearance.

放射性测量法（radiometric method，亦称伽马射线能谱法（gamma-ray spectrometric method））可测量地球表面附近观测到的伽马射线自然变化，该变化源于钾（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，以确保记录的响应仅由地下岩石的放射性信号所产生。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核验，以确保GA发布的最终数据满足使用需求。本次发布的放射性钍网格（radiometric thorium grid）单元尺寸为0.00083度（约合85米），展示了2008年西澳大利亚州（WA）邓利永地区（Dumbleyung，SWCC）的钍元素浓度，单位为百万分之一（ppm）。用于生成该网格的数据由西澳大利亚州政府（WA Government）于2008年采集，总测线长度达75805线公里，测线间距介于100米至400米之间，观测时的地形离地高度为60米。