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Neutron radiation is a form of ionizing radiation that presents as free neutrons.Typical phenomena are nuclear fission or nuclear fusion causing the release of free neutrons, which then react with nuclei of other atoms to form new nuclides—which, in turn, may trigger further neutron radiation.
Free neutrons do not directly ionize atoms, but they do indirectly cause ionizing radiation, so they can be a biological hazard, depending on dose. A small natural "neutron background" flux of free neutrons exists on Earth, caused by cosmic ray showers , and by the natural radioactivity of spontaneously fissionable elements in the Earth's crust .
Ionizing subatomic particles include alpha particles, beta particles, and neutrons. These particles are created by radioactive decay , and almost all are energetic enough to ionize. There are also secondary cosmic particles produced after cosmic rays interact with Earth's atmosphere, including muons , mesons , and positrons .
Hence, neutrons are said to be "indirectly ionizing". Even neutrons without significant kinetic energy are indirectly ionizing, and are thus a significant radiation hazard. Not all materials are capable of neutron activation; in water, for example, the most common isotopes of both types atoms present (hydrogen and oxygen) capture neutrons and ...
Coffee drinkers may want to think twice before having large doses of caffeine several hours before bed — if they want a good night's sleep. A new study suggests that certain doses of caffeine ...
The sum of the atomic mass of the two atoms produced by the fission of one fissile atom is always less than the atomic mass of the original atom. This is because some of the mass is lost as free neutrons, and once kinetic energy of the fission products has been removed (i.e., the products have been cooled to extract the heat provided by the reaction), then the mass associated with this energy ...
Nelly Furtado is ignoring the popular "New Year, New Me" mantra!. On Sunday, Jan. 5, the singer, 46, shared two photos of herself on Instagram wearing a bright orange bikini alongside an inspiring ...
Matthew Perry is showing Lisa Kudrow signs more than a year after his death.. When Drew Barrymore asked if Kudrow had ever stolen anything from set on the Jan. 7 episode of The Drew Barrymore Show ...
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