MRTAS Pipers River totalcount 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.放射测量法（radiometric, or gamma-ray spectrometric method）用于测定地球表面附近探测到的伽马射线自然变化，此类伽马射线源自钾、铀、钍的自然放射性衰变。该数据集由联邦、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。