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Technical issues related to the ERICA Tool (on Facilia website)
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Posted: 12/08/2010
Time series data
From:
Marko Černe
Jožef Stefan Institute
Slovenia
Question:
I am trying to apply the ERICA Tool to plants. If a plant, such as the Marsh Marigold, has a large leave on top of the stem - what dimensions should be used?
Answer:
To be honest perhaps the plant geometries have not been well thought out to date - they do not really represent whole-organisms as perhaps implied by documentation accompanying the ERICA Tool. The grass geometry in the ERICA Tool is taken from the ICRP Wild Grass RAP and is a 'grass spike'; no in soil dose rates are estimated only above ground. If you are concerned that the default plant may not adequately represent the species you want to assess then have a play with the create organism function of Tier 2 or 3: create an organism to represent your marigold leaf and compare DCC values to the default grass. We'd be interested to hear what you find.
Answered by Nick Beresford 26/09/2010
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Posted: 23/09/2010
Are dose conversion coefficient formula in ERICA consistent?
From:
Marko Černe
Jožef Stefan Institute
Slovenia
Question:
In the ERICA Tool are the all of the DCC values estimated using the same methodology or is Monte-Carlo simulation used on for terrestrial organisms?
Answer:
The key factor in the estimation of DCC is the absorbed fraction, and this is always calculated by Monte Carlo simulation using a phantom geometry. The only difference is that, historically, in FASSET, the aquatic and terrestrial formulas were calculated by two different Monte Carlo methods, but for ERICA the Ulanovsky and Proehl sphericity method (see ERICA papers) was adopted for everything, after having checked that, for aquatic organisms, both methods gave very similar results.
Answered by Jordi Vives i Batlle 23/09/2010
But note for terrestrial animals a shielding factor due to fur/feathers/skin is applied in the estimation of external dose rate. This is not used for aquatic animals.
Added by Nick Beresford 24/09/2010
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Posted: 12/08/2010
Plant geometries
From:
Marko Černe
Jožef Stefan Institute
Slovenia
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Posted: 23/09/2010
Are dose conversion coefficient formula in ERICA consistent?
From:
Marko Černe
Jožef Stefan Institute
Slovenia
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