A gamma radiometer or a gamma spectrometer.
Compass is a scientific instrument used to locate directions,specifically north.
transponder/radar
radar
Radar
radar
radar
Radar
radar
A compass is a scientific instrument used to locate the north magnetic pole. The magnetic changes in the Earth's core make the north magnetic pole move over time.
An Astrolabe.
measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects
Uranium is not used in medicine.