Ararat Ballarat total count 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. 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 Ararat Ballarat total count grid geodetic has a cell size of 0.00083 degrees (approximately 83m) and shows the terrestrial dose rate of the Ararat-Ballarat merge, 1990-1992. 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.

放射性测量法（radiometric method），亦称伽马射线能谱法（gamma-ray spectrometric method），可探测地球表面附近的伽马射线自然变化，此类射线源于钾（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的放射性信号。经处理后得到的数据集可通过解译揭示地下地质结构。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要求。地面伽马剂量率网格通过滤波后的钾、铀、钍网格的线性组合得到，随后对该网格应用低通滤波器，生成滤波后的地面伽马剂量率网格。
本阿拉拉特-巴拉腊特总计数大地测量网格（Ararat Ballarat total count grid geodetic）单元格大小为0.00083度（约83米），展示了1990-1992年阿拉拉特-巴拉腊特合并区域的地面伽马剂量率分布。制作该网格所用的数据由维多利亚州（VIC）政府于1990年采集，数据总长51328线公里，测线间距为200米至400米，地形离地高度为100米。