Gamma rays.
The name for the emissions of rays and particles by a radioactive material are called radioactive decay. There are many different types of radioactive decay that emit different rays and particles.
emits radioactive particles.
Gamma.
They originate in the nucleus of the atom.
Gamma rays
Its nucleus emits radioactive particles continuously.
This region become a radioactive contaminated area.
by ionising them
radioactive
AlphaGammaBeta
In physics, an alpha emitter is a radioactive substance which decays by emitting alpha particles.
Particles or electromagnetic waves