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Answer:
To represent radionuclides not included within the Tool as defaults you assuming Pu-239 for all alpha-emitters and Tc-99 for all other categories you have to assess . This appears to be applying the guidance developed which is as suggested by the England and Wales Environment Agency (EA) (confirmed) . You could argue this approach on the grounds of consistency. However, it depends upon the purpose of your assessment - do you want to be conservative?. If yes then the analogues suggested by EA may not always be the most conservative choices. However, the ERICA Tool allows you to explore alternatives as it has more fuctionality than the EA approach: 

As alternatives - (a) You can could add some of these the missing radionuclides in to the ERICA Tool and generate your own EMCLs... some  Some of the elements (e.g.) Ce would already have transfer parameters - this involves . This would involve using Tier 3 and you would then have to compare the resultant Environmental Medial Concentration Limits (EMCLs) to your media concentrations outside of the Tool as the user cannot add EMCLs (see Brown et al. 2008 for details of how to estimate EMCLs);

(b) look at the available EMCL values and pick the most conservative (i.e. lowest) available dependent upon emitter type. You can view the Tools EMCL value by selecting Database and then Parameter Database from any screen within the Tool.

There is not a  definitive 'correct' answer to this question - but you need to justify your choice.

Answered by Nick Beresford 05/08/2010

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