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On this page we try to provide answers to the questions you have asked. Feel free to use the Ask a Question form to comment on the questions or answers provided.

Posted:

...

Topic:
Effect of occupancy factors on estimated wholebody activity concentrations

From:
Marko Černe
Jožef Stefan Institute
Slovenia

Question:

How does the geometry or occupancy factor within the ERICA Tool influnce the CR value?

Answer:

There is no transformation of CRs according to geometry or occupancy factors - these are used in determination of dose only. Occupancy factors influence external dose estimates only. However, perhaps the guidance within the ERICA Help is to some extent misleading as it suggests the user can use the occupancy factors to model organims which do not spend 100 % of their time in a given ecosystem. However, if for example an occupancy factor of 0.4 is used the external dose rate would be reduced to 40 % of that if the organism was assumed to spend 100 % of its time in the ecosystem under consideration, whereas, the internal dose estimation (and wholebody activity concentration) would be the same (as if the animal spend 100 % of time in the ecosystem).

Answered by Nick Beresford 07/06/2010

Posted: 07/06/2010

Topic:
Modelling exposure to Acacia trees (EMRAS II Little Forest Burial Ground Scenario)

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Answered by Nick Beresford 08/06/2010

Posted: 25/05/2010

Topic:
Effect of occupancy factors on estimated wholebody activity concentrations

From:
Marko Černe
Jožef Stefan Institute
Slovenia

Question:

How does the geometry or occupancy factor within the ERICA Tool influnce the CR value?

Answer:

There is no transformation of CRs according to geometry or occupancy factors - these are used in determination of dose only. Occupancy factors influence external dose estimates only. However, perhaps the guidance within the ERICA Help is to some extent misleading as it suggests the user can use the occupancy factors to model organims which do not spend 100 % of their time in a given ecosystem. However, if for example an occupancy factor of 0.4 is used the external dose rate would be reduced to 40 % of that if the organism was assumed to spend 100 % of its time in the ecosystem under consideration, whereas, the internal dose estimation (and wholebody activity concentration) would be the same (as if the animal spend 100 % of time in the ecosystem).

Answered by Nick Beresford 07/06/2010