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On this page we try to provide answers to the questions you have asked (to ask a question select the Ask a question form). Also feel free to use the form to comment on the questions or answers provided.
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Technical issues related to the ERICA Tool (on Facilia website)
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Posted: 28/05/2014
From:
Mirjana Cujic, Serbia
Doses to worms on soil surface?
Question
If I have dose rate for P-32 in μGy/h for medium, how I can calculate activity in organism (worm), in this case organism is on medium (i.e. soil), not inside?
In ERICA database there is no value for DCC for P-32 for worm on soil the soil surface.
Answer:
If you select one of the default reference organisms then the DCCs should be for the mass as defined in Table 9 of the help file (i.e. 2.05E-12 kg for freshwater phytoplankton). The restrictions on size relate to organisms you can create.
Answered by Nick Beresford (NERC-CEH), 27/05/2014
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Posted: 28/05/2014
From:
Ben Jaeschke, Sweden
Mass of phytoplankton?
Question
In ERICA-Tool the help file documentation states that aquatic organisms have a minimum size of 1E-6 kg when calculating DCCs, but the Reference Phytoplankton has a mass of 1E-12 kg. Is it somehow possible to use the smaller reference value, or is the minimum mass upheld during assessment?
Answer:
If you select one of the default reference organisms then the DCCs should be for the mass as defined in Table 9 of the help file (i.e. 2.05E-12 kg for freshwater phytoplankton). The restrictions on size relate to organisms you can create.
Answered by Nick Beresford (NERC-CEH), 13/09/2013
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Posted: 28/05/2014
From:
Ben Jaeschke, Sweden
Assessments for Organisms living in air?
Question:
I am running an assessment using the ERICA tool, and am looking to create site-specific organisms in ERICA Tool. At present there appears no way to model organisms that live in trees or generally above the ground (external dose approximately equal to IN AIR). For example bats, or epiphytic lichens in trees.
Do you have any suggestions for how best to model these habitats?
One possible method would be to classify the specimen as “bird and flying insect”, but would this be acceptable?
Answer:
Yes I think this is acceptable however, you might have a problem with the limitations on sizes which can be created for organisms in air – 35 g to 2 kg. Most/all bat species in the UK have a mass below this. There is a limited evaluation of the impact on estimated dose for organisms outside this mass range .... select help from the ‘add organism’ screen and it should take you to correct place in the help file. Otherwise you probably need to also acknowledge that you are assuming no contribution to dose from the tree.
Answered by Nick Beresford (NERC-CEH), 10/09/2013
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