Question: Consider a neutron transmission experiment through a ({ }^{232} mathrm{Th}) foil of thickness (0.001 mathrm{~cm}). The neutron beam is mono-energetic with a certain energy. Density

Consider a neutron transmission experiment through a ${ }^{232} \mathrm{Th}$ foil of thickness $0.001 \mathrm{~cm}$. The neutron beam is mono-energetic with a certain energy. Density of the material of the foil is $12 \mathrm{~g} / \mathrm{cm}^{3}$. If $90 \%$ of the incident neutrons are lost on transit through the foil, find the total cross-section of ${ }^{232} \mathrm{Th}$ at that energy.

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