Merlinleigh 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.

辐射测量法（或称伽马能谱法，gamma-ray spectrometric method）用于测量地球表面附近探测到的伽马射线的自然变化，这些变化由钾、铀和钍的自然放射性衰变引起。这些数据由联邦政府、州及北领地（NT）政府与私营部门开展的航空地球物理调查收集获得。