Engine Wear
A metal ring is made radioactive by exposing it to neutrons in a nuclear reactor. It is then fitted onto an engine piston transferring radioactive β-emitting atoms to the engine oil as the engine works. The radioactivity of the engine oil can then be measured to calculate the rate of engine wear.
Thickness Monitoring
The thickness of metal foil or paper can be monitored by detecting the amount of radiation passing through a thin sheet. If the count detected is low, rollers can be moved closer together to make the roll thinner.
