MRTAS SW Tasmania percent potassium 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 potassium grid has a cell size of 0.00042 degrees (approximately 40m) and shows potassium element concentration of the South West Tasmania, Tas, 2001 (WTRMP Area D) in units of percent (or %). The data used to produce this grid was acquired in 2000 by the TAS Government, and consisted of 13701 line-kilometres of data at 200m line spacing and 80m terrain clearance.

放射性测量法（radiometric method，亦称伽马射线能谱法（gamma-ray spectrometric method））可检测地球表面附近的伽马射线自然波动，该波动源于钾（K）、铀（U）与钍（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由地下岩石的放射性贡献所致。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检查，以确保GA发布的最终数据符合使用要求。本放射性钾元素网格（radiometric potassium grid）的像元尺寸为0.00042度（约合40米），展示了2001年塔斯马尼亚州（Tas）西南部WTRMP D区的钾元素浓度，浓度单位为百分比（%）。本网格所用数据由塔斯马尼亚州政府（TAS Government）于2000年采集，数据覆盖总长度达13701线千米，测线间距为200米，地形离地高度为80米。