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{"ops":[{"insert":"For neutron with energy 0.025 eV, the values of the total scattering cross-section \u03c3"},{"attributes":{"script":"sub"},"insert":"sc"},{"insert":"\u00a0and the absorption cross-section \u03c3"},{"attributes":{"script":"sub"},"insert":"abs"},{"insert":"\u00a0for atoms of nitrogen and oxygen are:\n\n\u03c3"},{"attributes":{"script":"sub"},"insert":"sc"},{"insert":"\u00a0= 11.5 for Nitrogen\u00a0and 1.8\u00a0for Oxygen\n\u03c3"},{"attributes":{"script":"sub"},"insert":"abs"},{"insert":"\u00a0=\u00a04.2 for Nitrogen and ~0\u00a0for Oxygen\n\n"},{"attributes":{"bold":true},"insert":"Estimate the attenuation"},{"insert":" of a beam of neutrons of 0.025 eV in 1 m of dry air at a temperature of 20"},{"attributes":{"script":"super"},"insert":"o"},{"insert":"\u00a0C and and atmospheric pressure.\u00a0The concentration ratio of oxygen\/nitrogen is 20%\/80%.\n"}]}
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