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Posted: 05/08/2010

Topic:

Question about dose rate to flying animals

From:
Susan Schneider
Serco
UK

Question:

Please can you clarify about contaminated air.

Box 4.1 in The D-ERICA :Integrated Approach report, mentions chronic atmospheric releases of H, C, P and S, and in the report R+D 128, Sec 5.6, dose rates for these are calculated from concentrations in air.

Has this dependence on air concentration been removed in this more recent version of ERICA (I had previously used the prototype version, in Dec 2006)? Is the chronic atmospheric release only relevant when using the transport models?

Answer:

_For H, C, S and P air concentrations are the input rather than soil concentrations.
ERICA uses a specific activity approach to then estimate biota concentrations of C&H (there's an article by Galeriu et al describint this). This is in-line with approaches taken for human assessment (e.g. see IAEA 2010 TRS472). Honest answer to S and P is that ERICA adopted parameters from R&D128.

Note that the air concentrations are used to estimate activity concentrations in biota they are not used to estimate external dose rates from air. External dose rates for H, C, S and P are assumed to be zero in the ERICA Tool anyway (most models assume same or very low external dose rates - see Vives i Batlle et al 2007 http://wiki.ceh.ac.uk/x/UoDqBg^{Image Added}).
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Answered by Nick Beresford 05/08/2010

Posted: 05/08/2010

Topic:

Question about terrestrial occupancies in ERICA

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