Kidson AreaB 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, uranium and thorium. The data are collected on airborne geophysical surveys conducted by Commonwealth, State & NT Governments and the private sector.

放射性测量法（radiometric method），亦称伽马射线能谱法（gamma-ray spectrometric method），可对地球表面附近探测到的伽马射线自然变化进行检测，此类变化源于钾、铀、钍的天然放射性衰变。本数据集由英联邦（Commonwealth）、各州及北领地（NT）政府与私营部门开展的航空地球物理调查采集获得。