GSWA Yowalga Sub Basin thorium grid geodetic

This GSWA Yowalga Sub Basin thorium grid geodetic is an airborne-derived radiometric thorium window countrate grid for the Yowalga Sub-Basin, WA, 1995-1996 survey. 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 thorium (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 GSWA Yowalga Sub Basin thorium grid geodetic has a cell size of 0.001 degrees (approximately 105m). The data are in units of counts per second (or cps). The data used to produce this grid was acquired in 1995 by the WA Government, and consisted of 87401 line-kilometres of data at 500m line spacing and 80m terrain clearance.

本数据集为西澳大利亚州（WA）约尔加次盆地1995-1996年航测项目的航空放射性钍窗口计数率栅格数据（GSWA Yowalga Sub Basin thorium grid geodetic）。放射性测量法，即γ射线能谱法，通过探测地球表面附近的γ射线，测量其因钾（K）、铀（U）及钍（Th）自然放射性衰变产生的自然变化。所采集的数据经标准流程处理，以确保记录的响应仅源于地下岩石的放射性信号。经处理得到的数据集可用于解译，以揭示地下地质构造。经处理的数据由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GSWA约尔加次盆地钍栅格大地测量数据的栅格单元尺寸为0.001度（约105米），数据单位为每秒计数（counts per second，简称cps）。本栅格数据的原始数据集由西澳大利亚州政府于1995年获取，总测线长度达87401线公里，测线间距为500米，飞行离地高度为80米。