Uncertainty propagation for fixed source mode

Dear community,

I ran a model in which I tallied/computed the spectrum of a nuclear reactor at given point. This point corresponds to the exit of an experimental channel in a research reactor.
Then, as we’re doing transmission measurements, I use this spectrum for a simple 1D problem in fixed source mode (source-transmission layer-detector).

However, I wonder, when defining the source for the fixed-source calculation, how do I consider the uncertainties associated to the spectrum in the first step of my calculation scheme.

Best regards,
Juan

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