GSWA Yowalga Sub Basin total count 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），又称伽马射线能谱法（gamma-ray spectrometric method），通过探测地球表面附近的伽马射线，可量化反映钾、铀、钍自然放射性衰变所产生的伽马射线的天然变化。此类数据由澳大利亚联邦、各州及北领地政府与私营部门开展的航空地球物理调查采集所得。