Rawlinson dose rate 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（又称伽马射线光谱法，gamma-ray spectrometric method）旨在测量地球表面附近检测到的伽马射线的自然变化，此类变化源于钾、铀和钍的自然放射性衰变。相关数据由英联邦、州及北领地（NT）政府与私营部门开展的航空地球物理调查（airborne geophysical surveys）采集所得。