If air is 80% N15 and 20% O16. Using the data below, calculate the average distance a thermal neutron travels in air before having an interaction. Air density = 1.202 gm/cm3 %3D 016 atomic wt = 15.994 gm N15 atomic wt 14.0067 gm N15 total microscopic cross o16 total microscopic cross section = 4.03 b 12.20 b %! section %3D
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