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Simple answer is yes if you did this you would double account (this is discussed a little in Vives i Batlle et al. 2007 and Beresford et al. 2010) But if you are using the ERICA Tool (and I think the same is true of RESRAD-BIOTA, which uses a longer cut-off time than 10 d) this should not occur with the default radionuclide list. It would if, for instance, you were considering U-235 and added Th-231 to the radionuclide list (using the ‘add isotope’ option in Tier 1 2 or 23) as Th-231 will already be included in the U-235 DCC.

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