Many people work near a source of nuclear radiation to detect the amount of exposure they have to radiation they most likely will use a

Many people work near a source of nuclear radiation to detect the amount of exposure they have to radiation they most likely will use a Film badge. It  is a personal dosimeter used for monitoring cumulative radiation dose due to ionizing radiation.

The geological theory that states that pieces of earth's lithosphere are in constant slow motion is the theory of plate tectonics.