11. He says the Spallation Neutron Source will restore U . S . leadership in the field. 12. This isotope is generated by spallation reactions on magnesium, sodium, silicon, and aluminium. 13. These isotopes are obtained by nuclear fission or proton induced spallation of heavy elements as uranium. 14. It is practiced at research reactors and spallation neutron sources that provide neutron radiation of sufficient excitations. 15. Recently there has been the development of spallation sources which can create a rapid pulse of neutrons. 16. Laser energy is used for the process of thermal spallation , melting, or evaporation of rock. 17. Since 1976 he has been working at the Forschungszentrum J�lich, doing research on spallation neutron sources. 18. Traditionally, nuclear reactors have been used, although sources producing neutrons by spallation are becoming increasingly available. 19. Peak dynamic pressure can also influence the selection of the outermost TPS material if spallation is an issue. 20. The spallation process at SNS begins with negatively charged hydrogen ions that are produced by an ion source.
