Which one of the following is not considered a part of particulate radiation?

Particulate radiation consists of particles that have mass and can carry energy. This category includes protons, neutrons, and electrons, all of which are subatomic particles that can have significant interactions with matter.

Protons and neutrons are found in the nucleus of an atom and contribute to its mass, while electrons are negatively charged particles that orbit around the nucleus. Each of these particle types can produce radiation as they interact with other materials.

In contrast, x-rays are a form of electromagnetic radiation. They are high-energy photons that have no mass and do not consist of particles in the traditional sense. Instead, x-rays are produced when high-energy electrons hit a target material, resulting in the emission of energy in the form of electromagnetic waves. Because they do not consist of particles but rather waves, x-rays do not belong to the category of particulate radiation.