Optimizing Activation Coil Selection for Maximum Gamma Flux

[shakystew]

What is best way to figure out which of these activation coils would yield a higher gamma flux:

27Al, 58Ni, and 115In.

I have a PuBe neutron source, which I am told to just use a 4.5MeV neutron-energy. I am running MCNP calculations to find flux at a point away from the foil.

I knows the reactions:
n + 27Al → 24Na + α
n + 58Ni → 58Co + p
n + 115In → 115Inm + n’

Which foils will yield the highest and lowest fluxes on the detector?

 

[mfb]

You'll need the cross-sections for those reactions (and the half-life of ^115mIn) and some data about the sensitivity of the detector.