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The allometric foodchain modelling functionality available in RESRAD-BIOTA is not applicable to fish.

_If you assume that an organism is at the sediment water interface the external does rate is estimated as:
0.5*(DCCexternal*sediment activity concentration) + 0.5*(DCCexternal*water activity concentration); sediment .

Sediment will generally contribute the most to the total external dose rate. If you do not have sediment activity concentrations to input these will be estimated from kd and input water activity concentrations._

Answered by Nick Beresford 15/12/2010

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