Tasmania Offshore Area4 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 Tasmania Offshore Area4 total count grid geodetic has a cell size of 0.00083 degrees (approximately 82m) and shows the terrestrial dose rate of the Tasmania Offshore, TAS, 1994. The data used to produce this grid was acquired in 1994 by the TAS Government, and consisted of 93301 line-kilometres of data at a line spacing between 400m and 800m, and 130m terrain clearance.

放射测量法（伽马能谱法）通过检测地球表面附近的伽马射线，来反映由钾（K）、铀（U）与钍（Th）的天然放射性衰变所产生的伽马射线自然变化。所采集的数据将通过标准化流程进行处理，以确保记录的响应仅源于地下岩石。经处理后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要求。地面剂量率网格通过经滤波的钾、铀、钍网格的线性组合得到，随后对该网格施加低通滤波，生成滤波后的地面剂量率网格。本塔斯马尼亚近海4区大地测量总计数网格的像元大小为0.00083度（约82米），展示了1994年塔斯马尼亚近海（TAS）的地面剂量率。用于生成该网格的数据由塔斯马尼亚州政府于1994年采集，数据总测线长度达93301线公里，测线间距介于400米至800米之间，作业离地高度为130米。