N natural radiation Radiation that is always present in the environment from such sources as cosmic rays and radioactive materials in rocks and soils. Also known as background radiation. N ational E nvironmental P olicy A ct, requires a study of the impacts of activities at federal facilities. A particle that appears in the nucleus of all atoms except hydrogen. Neutrons are one of three basic particles that make up the atom.
Neutrons have no electrical charge.
O f A vailability, published when a document on some aspect of cleanup is issued. Documents are available in the administrative record and information repositories. L ist, the list of the nation's worst Superfund sites. NRC N uclear R egulatory C ommission NTS N evada T est S ite, a repository for radioactive wastes. The central part of an atom that contains protons, neutrons and other particles.