Water is sometimes used as a shielding material in nuclear power plants, because it is very…

Water is sometimes used as a shielding material in nuclear
power plants, because it is very effective at slowing down high-speed neutrons.
Suppose that a radiation shield made out of water 1 m thick is able to slow
down most 1 MeV neutrons to thermal speeds. If we place a sheet of Boron-10 (a
good neutron absorber) on the side of the shield that is furthest away from the
neutron source, how many times more likely is it for the Boron-10 to absorb a
thermal neutron than a 1 MeV neutron?

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