X-rays are photons.
X-rays are electromagnetic radiation or light. "X-ray" is used to specifically refer to light that has a wavelength of about 1 nanometer.
Light consists of photons so X-rays are photons.
Protons and neutrons are massive particles that make up the nucleus of an atom and can constitute particle radiation.
The positron is the electron's antiparticle. It can be a product of some nuclear reactions like when two protons fuse to form deuterium in the sun.