Neutron Radiation

The atomic nucleus contains neutrons and protons. Like protons, neutrons have a large mass; however, they do not have an electric charge, unlike protons. This allows neutrons to slip more easily between atoms. When a free neutron is emitted, usually through spontaneous or induced nuclear fission, and then absorbed into a stable atom, the atom becomes unstable and more likely to emit ionizing radiation. Thus, neutrons are the only type of radiation able to make other materials radioactive.

Neutrons can travel hundreds or even thousands of meters in the air. High-energy neutrons can bypass the protective outer layer of the skin and deposit their energy, causing ionization. Nevertheless, neutrons can be effectively stopped by a hydrogen-rich material, such as concrete or water.

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