GSQ Cape York 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），亦称伽马能谱法（gamma-ray spectrometric method），可探测地球表面附近的伽马射线自然变化，此类伽马射线源自钾、铀、钍的天然放射性衰变。此类数据由联邦政府、各州及北领地政府与私营机构开展的航空地球物理调查采集。