* Solid: Radiation can be emitted from radioactive solids, like uranium ore.

* Liquid: Radioactive isotopes can be dissolved in liquids, and the solution will emit radiation.

* Gas: Radioactive gases like radon can be emitted from the ground.

It's important to understand that radiation is a form of energy transfer, not a state of matter itself. Radiation can occur when atoms are unstable and release energy in the form of particles or electromagnetic waves.

Here's a breakdown of the different types of radiation:

* Alpha radiation: Consists of helium nuclei (2 protons and 2 neutrons) emitted from the nucleus of an atom. It's relatively heavy and has a short range, easily stopped by a sheet of paper.

* Beta radiation: Consists of electrons or positrons (antimatter electrons) emitted from the nucleus of an atom. It's lighter than alpha radiation and can penetrate further, stopped by a thin sheet of aluminum.

* Gamma radiation: Is a form of high-energy electromagnetic radiation emitted from the nucleus of an atom. It has the highest penetrating power and can be stopped by thick layers of lead or concrete.