Mt Elizabeth totalcount grid

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（radiometric）或称伽马能谱法（gamma-ray spectrometric method）可测量地球表面附近探测到的伽马射线自然变化，此类变化源自钾、铀及钍的自然放射性衰变。此类数据采集自由联邦、州及北领地（NT）政府与私营机构开展的航空地球物理勘探作业。