The ERICA Tool is a computerised, flexible software system that has a structure based upon the tiered ERICA Integrated Approach to assessing the radiological risk to biota. The Tool guides the user through the assessment process, recording information and decisions and allowing the necessary calculations to be performed to estimate risks to selected animals and plants. Tier 1 assessments are media concentration based and use pre-calculated environmental media concentration limits (EMCLs) to estimate risk quotients. Tier 2 calculates dose rates but allows the user to examine and edit most of the parameters used in the calculation including concentration ratios, distribution coefficients, percentage dry weight soil or sediment, dose conversion coefficients, radiation weighting factors and occupancy factors. The user can also input biota wholebody activity concentrations in Tier 2 if available rather than rely upon concentration ratios. Tier 3 offers the same flexibility as Tier 2 but allows the option to run the assessment probabilistically if the underling parameter probability distribution functions are defined. Results from the Tool can be put into context using incorporated data on dose effects relationships (using the FREDERICA database) and background dose rates. The Tool has simple transport models embeded to enable conservative estimates of media activity concentrations from discharge data if measurements are not available; the transfort models are taken from IAEA (2001) Generic models for use in assessing the impact of discharges of radioactive substances to the environment. IAEA Safety Rerport Series 19 STI/PUB/1102.
The Tool is freely available from: http://www.project.facilia.se/erica/download.html.
The ERICA Tool is being maintained by a consortium comprising the Norwegian Radiation Protection Authority, Centre for Ecology & Hydrology (UK), Environment Agency (England and Wales), IRSN (France) the Swedish Radiation Safety Authority and CIEMAT (Spain).
The ERICA Tool has been applied by both the developers and independent users in intercomparison exercises of the IAEA's EMRAS programmes.