| 单词 | thermal neutron |
| 释义 | > as lemmasthermal neutron thermal neutron n. a neutron which is in thermal equilibrium with its environment (see quot. 1966); cf. slow neutron n. at slow adj. Compounds 2. ΘΚΠ the world > matter > physics > atomic nucleus > nuclear fission > nuclear reactor > [noun] > thermal or slow reactor > neutron in equilibrium thermal neutron1938 1938 Physical Rev. 54 235/1 (heading) Collimated, variable energy beam of pure thermal neutrons. 1945 H. D. Smyth Gen. Acct. Devel. Atomic Energy Mil. Purposes viii. 79 We now introduce a factor f, called the thermal utilization factor, which is defined as the probability that a given thermal neutron will be absorbed in the uranium. 1966 C. R. Tottle Sci. Engin. Materials x. 236 Fast neutrons may be moving at speeds of the order of 1010 cm sec—1 with an energy of 1 to 10 MeV. When slowed down to a similar order of energy to that of the thermal vibration of atoms (hence called thermal neutrons) the speed is about 105 cm sec—1 at an energy of 1 eV. < as lemmas |
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