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A narrow beam of thermal neutrons passes through a plate of iron whose absorption and scattering effective

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A narrow beam of thermal neutrons passes through a plate of iron whose absorption and scattering effective cross-sections are equal to σa = 2.5 b and σb = 11 b respectively. Find the fraction of neutrons quitting the beam due to scattering if the thickness of the plate is d = 0.50 cm.

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In traversing a distance d the fraction which is either scattered or absorbed is clearly

by the usual definition of the attenuation factor. Of this, the fraction scattered is (by definition of scattering and absorption cross section)

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