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The key factor in the estimation of DCC is the absorbed fraction, and this is always calculated by Monte Carlo simulation using a phantom geometry. The only difference is that, historically, in FASSET, the aquatic and terrestrial formulas were calculated by two different Monte Carlo methods, but for ERICA the Ulanovsky and Proehl sphericity method (see ERICA papers) was adopted for everything, after having checked that, for aquatic organisms, both methods gave very similar results.
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But note for terrestrial animals a shielding factordue factor due to fur/feathers/skin is applied in the estimation of external dose rate. This is not used for aquatic animals.
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