Absorbed fraction

The absorbed fraction, ϕ(r_T ← r_s,E_R,i), is the fraction of energy E_R,i of the i^th radiation of type R emitted within the source region r_S that is absorbed in the target region r_T. These target regions may be tissues (e.g. liver) or may be cell layers within organs (e.g. stem cells of the stomach wall).

(Adopted from ICRP Publication 133, 2016)

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