GSNSW Exploration NSW Area O NW Eromanga 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 0.00077 degrees (approximately 80m) and shows thorium element concentration of the NSW DMR, Discovery 2000, AREA O, NW EROMANGA, NSW 2000 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2000 by the NSW Government, and consisted of 54898 line-kilometres of data at a line spacing between 200m and 400m, and 60m terrain clearance.

放射测量法，亦称伽马射线能谱法，可探测地表附近的伽马射线自然变化，该变化源于钾（K）、铀（U）及钍（Th）的自然放射性衰变。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。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要求。本放射测量钍格网的单元尺寸为0.00077度（约80米），展示了NSW DMR发布的2000年勘探项目（Discovery 2000）中，新南威尔士州EROMANGA西北部O区域的钍元素浓度，单位为百万分比（ppm）。本格网所用数据由新南威尔士州政府于2000年采集，总测线长度达54898线公里，测线间距介于200米至400米之间，航高为60米。