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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 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. As alternatives - (a) You can add some of these radionuclides in ERICA and generate your own EMCLs ... some of the elements (e.g.) Ce would already have transfer parameters - this involves 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

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