How to get the scattered dose from concrete using MCNP5?

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To obtain the scattered dose from concrete using MCNP5, the user seeks a method to isolate scattered photons from a point source. They are comparing scattered and direct doses for a point detector in a shielding project. The user has tried using tallies with energy bins but finds it complex to filter only the scattered photons. A proposed solution involves calculating the dose in air alone and then in both air and concrete, subtracting the two to derive the scattered dose from the concrete. The discussion emphasizes the need for effective techniques in MCNP5 for accurate dose assessment.
DF19
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Hello fellow nuclear engineers and physicists,

Does anyone know how to just get the scattered dose from a surface like concrete using MCNP5? I'm doing a project for a shielding class and I need to compare scattered dose and direct (uncollided) dose for a point detector. The photons are coming from a point source.

I've experimented with tallies associated with energy bins, but it's getting real complicated and I can't find a clever way to filter just the photons scattered from concrete.

My only theory is finding the dose with just air, then finding the dose with the concrete and air and subtracting the two to find the scattered dose from the concrete.
 
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Here is my input file, it has the geometry in it.
 

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