Page History

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Technical issues related to the ERICA Tool (on Facilia website)

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Posted: 24/02/2012
From:
Chantal Medri
Canada

Dose Rate Equation

Question:

I am looking for the dose rate equation used by ERICA which takes into account the media. For instance, for the aquatic organism, I expect that the calculated dose rate should look something like this:

D= DCC(ext, water) OF(water)+0.5xOF(water surface)+0.5xOF(sediment surface)xC(water)+OF(sediment)+0.5xOF(sediment surface)xC(sediment).

However, I have not been able to find any documentation that supports this.

Furthermore, are the DCCs for water and sediment the same? Sediment is denser than water, so I expected that different DCCs should be used.

Answer:
To Follow

Answered by Justin brown 24/02/2012

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Posted: 24/02/2012
From:

Chantal Medri
Canada

Double Counting contribution from daughters

Question:

Seeing as the DCCs that are calculated include progeny with half-lives less than 10 days, does that mean that if I included a radionuclide with a half-life of less than 10 days in my assessment, that its contribution will be double counted?

Answer:

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 be if, for instance, you were considering U-235 and added Th-231 to the radionuclide list (using the ‘add isotope’ option in Tier 1 or 2).

Answered by Nick Beresford 24/02/2012

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Posted: 07/02/2011

DCC Database

From:
Maria Sotiropoulou
Demokritos
Greece

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