A narrow beam of thermal neutrons is attenuated eta= 360 time s after passing through a cadmium plate of thickness d= 0.50mm. Determine the effective corss-section of interaction of these neutrons with cadmium nuclei.

A narrow beam of thermal neutrons is attenuated eta= 360 time s after

1.	A narrow beam of thermal neutrons is attenuated eta= 360 time s after passing through a cadmium plate of thickness d= 0.50mm. Determine the effective corss-section of interaction of these neutrons with cadmium nuclei.
Answer» Solution :We have the relation `(1)/(eta)=e^(-nsigma)` Here`(1)/(eta)=` attentution factor `n=` no. of `Cd` nuclei PER UNIT volume `SIGMA=` effective cross section `d=` thickness of the plate Now `n=(rhoN_(A))/(M)` `(RHO=` density, `M=` Molar weight of `Cd, N_(A)=` AVOGADRO number.) Thus `sigma=(M)/(rhoN_(A)d)In eta = 2.53kb`

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A narrow beam of thermal neutrons is attenuated eta= 360 time s after passing through a cadmium plate of thickness d= 0.50mm. Determine the effective corss-section of interaction of these neutrons with cadmium nuclei.

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