Positron

Positron Emission Tomography uses a radioactive tracer to visualize metabolic activity within the human body.

A positron is a small particle similar to an electron, but with a positive electric charge.

He's interested in positron physics.

A positron is an antielectron.

A positron is an “antielectron”: it has the mass of an electron but a positive charge.

The notion of a positron weapon remains the stuff of science fiction.

If these particles carry unit positive charge the curvatures and ionizations produced require the mass to be less than twenty times the electron mass. These particles will be called positrons.