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_In Tier 2 you can select the occupancy factors to be what you want - these are  used to determine the external exposure only. The dose rate at water surface will be  50 % of that in water column. The DCCs for sediment and water are the same. For  sediment-water interface the dose rate is  (\[0.5*DCC_external*sediment activity  concentration\]+\[0.5*DCC_external*water activity concentration\])._ _The DCCs for sediment and water are the same._ _See response  posted to question (from onMarko website Q&AČerne) below re how occupancies are (not) used in  estimatation of internal dose rate._