Broken Hill Detail 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 Broken Hill Detail total count grid geodetic has a cell size of 0.00021 degrees (approximately 21m) and shows the terrestrial dose rate of the Broken Hill N.S.W, 1994. The data used to produce this grid was acquired in 1994 by the NSW Government, and consisted of 56310 line-kilometres of data at a line spacing between 100m and 400m, and 60m terrain clearance.

辐射测量法，或称伽马射线能谱法（radiometric, gamma-ray spectrometric method），通过检测地球表面附近的伽马射线自然变化开展测量——此类伽马射线源自钾（K）、铀（U）与钍（Th）的自然放射性衰变。采集所得数据将通过标准流程进行处理，确保记录的响应仅来自地下岩石。最终生成的数据集可用于解译以揭示地下地质构造。处理后的数据将由GA地球物理学家开展质量校验，确保GA发布的最终数据符合使用要求。
地面剂量率网格（terrestrial dose rate grid）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（low pass filter），以生成滤波后的地面剂量率网格。
此次布罗肯希尔详情区总计数大地测量网格的单元尺寸为0.00021度（约21米），展示了1994年新南威尔士州布罗肯希尔地区的地面剂量率。用于生成该网格的数据由新南威尔士州政府于1994年采集，涵盖56310线公里的实测数据，测线间距介于100米至400米之间，地形离地高度为60米。