Fractional absorption in the gastrointestinal tract

The fraction of an element directly absorbed from the alimentary tract into blood, referred to as the gut transfer factor, and designated as f₁ in the ICRP Publication 30 gastrointestinal tract model and f_A in the revised ICRP Publication 100 Human Alimentary Tract Model.

(Adapted from ICRP Publication 130, 2015)

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from ICRP Publication 119, 2012

The f₁ value is the fraction of an ingested element absorbed directly into body fluids.