X-rays usually have lower energies than gamma rays. They are neutral particles, and they can penetrate through materials easily. As was the case for gamma rays, this makes them both useful and dangerous.
Neutrons can induce nuclear reactions readily, and they are products of many reactions.
They have about the same mass as neutrons, but they have a positive charge of one unit. As a result, they interact strongly with the electrons in normal matter, and they have shorter ranges than neutrons of similar energy. Beams of energetic protons can be produced by accelerators, and they have been used for medical radiotherapy and to produce intense pulses of neutrons for studies of materials. The light ions with charge 2 interact with matter so strongly that most natural alphas won't penetrate your skin or a piece of paper, but alpha-emitting radioactive materials can be dangerous if they get inside the body. Projectiles heavier than the alpha particle can be produced and made energetic with accelerators.