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Neutron Absorption

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What thickness of cadmium is required to absorb 50% of an incident beam
of thermal neutrons? Given: σ_capture = 2550 barns, ρ=8.65 g cm^-3,

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Exploring the decay of Plutonium 241

Pu-241 is produced from neutron absorption by Pu-240 (which is produced by neutron absorption by Pu-239). Calculate the fractional in-growth of Am-241 from Pu-241 (i.e. number ratio Am-241/Pu-241) from time = 0 to 200 years. Pu-241 is the parent and Am-241 is the daughter.

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