Ararat Ballarat 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 83m) and shows thorium element concentration of the Ararat-Ballarat merge, 1990-1992 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1990 by the VIC Government, and consisted of 51328 line-kilometres of data at a line spacing between 200m and 400m, and 100m terrain clearance.

辐射测量法（radiometric method），亦称伽马能谱法（gamma-ray spectrometric method），可检测地球表面附近的伽马射线自然变化——此类射线源自钾（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化流程处理，以确保记录到的响应仅由地下岩石产生。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查，以确保GA发布的最终数据符合使用需求。本辐射测量钍网格的像元大小为0.00083度（约83米），展示了1990年至1992年阿拉拉特-巴拉腊特合并区域的钍元素浓度，单位为百万分率（ppm）。本网格所用数据由维多利亚州（VIC）政府于1990年采集，总数据量达51328线公里，测线间距介于200米至400米之间，地形离地高度为100米。