Neutron Radiation

Neutrons are electrically-neutral subatomic particles. Atomic nuclei consist of protons and neutrons. They have an antiparticle with opposite spin, the antineutron.

Because of their properties (mass, magnetic moment, etc.), neutrons can be applied for microscopy. In 2152, the Enterprise NX-01 had a neutron microscope aboard. (ENT: "Stigma")

In 2265, Captain James Kirk, fearful that he would not be able to deal with the mutated Gary Mitchell, left orders recommending that all of planet Delta Vega be subjected to a lethal concentration of neutron radiation if he did not contact the USS Enterprise in twelve hours. (TOS: "Where No Man Has Gone Before")

Starships tend to emit quantities of neutron radiation as a property of their warp cores, detectable by any other starships close enough to scan for it. In 2293, Captain Spock noted a large concentration of neutron radiation that resulted from a Klingon Bird-of-Prey commanded by General Chang moving into position at extremely close quarters to the hull of Spock's ship, the USS Enterprise-A. (Star Trek VI: The Undiscovered Country)