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Relevant equation: I(x) = I

_{0}exp(-N*σ*x)

where I is intensity, N is the number density, and σ is the cross section.

I believe that it would be better to alternate the two pure materials. My thought process is that this way the beam ensures going through regions of just A and B. This way, if material A is better at attenuating the beam, it will ensure interactions with A. I'm hoping someone can validate my thought process or possibly give an alternate reasoning. Thank you in advance!