FACTOID # 89: In the 1990's, nearly half of all arms exported to developing countries came from the United States of America.
 
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Encyclopedia > Neutron source

A neutron source is a device, used in solid state physics (see neutron diffraction), particle physics and to start nuclear chain reactions, that emits neutrons. Usually, the neutron source is high speed atoms hitting a metal of an isotope with many neutrons. This reaction can be seen as bright sparks, but the sparks each have many neutrons in them.


Neutrons can be generated by mixing beryllium and an alpha emitter such as radium or polonium. Neutrons are liberated when beryllium is hit by alpha particles at about 30 neutrons/million alpha particles.


See also


  Results from FactBites:
 
NIST Center for Neutron Research (304 words)
Neutron tomography gives 3D images of water in a proton exchange membrane fuel cell.
Neutron interferometry, neutron radiography, and fundamental physics using neutrons are active research areas at the NCNR
The Center For High Resolution Neutron Scattering (CHRNS), supported by the National Science Foundation and NIST, is an important component of the NCNR, providing users with access to six neutron scattering instruments.
neutron: Definition and Much More from Answers.com (2749 words)
Neutrons and protons are the constituents of atomic nuclei.
Neutrons are released in the act of fission, and nuclear reactors are unexcelled as intense neutron sources.
Neutrons are complementary to the latter in terms of atomic contrasts by different scattering cross sections; sensitivity to magnetism; energy range for inelastic neutron spectroscopy; and deep penetration into matter.
  More results at FactBites »


 

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