GSNSW Exploration NSW Area R Enngonia 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），或称伽马射线能谱法（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。这些数据通过联邦、州及北领地政府和私营部门开展的航空地球物理调查（airborne geophysical surveys）收集获得。