The charged particle emits the characteristic radiation you have found at the web site you cited.

We can measure the rate of decay at which radioactive particles emit protons, neutrons, and electrons.

A positively charged particle emitted from the nucleus of an atom during radioactive decay.

Each particle emitted corresponded to one quantum of light hitting the metal.

We take measurements of how many particles the sample emits over ten-minute periods.

The danger, say health specialists, is that the particles emit low levels of radiation.

The detection was based on the alpha particles emitted as they decayed, he said.

These particles emit alpha-radioactivity, which is particularly aggressive towards living tissue.

First, nuclear particles can easily emit photons of light.

The over-excited particles emit so much light, in fact, that their energies fall to a level at which they can combine to form stable atoms.