Naturally occurring manganese is 100% 55 Mn. This nuclide has a thermal neutron capture cross…

Naturally occurring manganese is 100% 55Mn. This
nuclide has a thermal neutron capture cross section of 13.3  10-24
cm2 . The product of neutron capture is 56Mn, which is a
beta and gamma emitter with a 2.50-h half-life. When Figure 32-9 was produced,
it was assumed that the sample was irradiated for 1 h at a neutron flux of 1.8  1012
neutrons/(cm2 s) and that 10 cpm above background could be detected.

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Naturally occurring manganese is 100% 55 Mn. This nuclide has a thermal neutron capture cross…
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(a) Calculate the minimum mass of manganese that could be
detected.

(b) Suggest why the calculated value is lower than the
tabulated value.

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