| 41. | This detector shows good efficiency at detecting fast neutrons in a background of thermal neutrons and gamma radiation.
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| 42. | The alpha particles emitted by the decay of the americium collide with the light beryllium nuclei, producing fast neutrons.
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| 43. | Peierls attempted to simplify the problem by using the fast neutrons produced by fission, thus omitting consideration of moderator.
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| 44. | Bombarding 238 U with fast neutrons induces fissions, releasing energy as long as the external neutron source is present.
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| 45. | 236 U and most other actinides are fissionable by fast neutrons in a nuclear bomb or a fast neutron reactor.
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| 46. | Nuclear explosions form 10 Be by a reaction of fast neutrons with 13 C in the carbon dioxide in air.
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| 47. | My main idea was that for the atom bomb the chain reaction would have to be propagated by fast neutrons.
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| 48. | A helium-3 and deuterium mix gives off much fewer fast neutrons, but requires about four times the temperature to react.
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| 49. | 236 U and most other actinides are fissionable by fast neutrons in a nuclear bomb or a fast neutron reactor.
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| 50. | When these fast neutrons collide with hydrogen nuclei present in the soil being studied, they lose much of their energy.
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