PROTECTFP6-036425 Radioprotection of the environment in France: IRSN current views and workplan K....
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Transcript of PROTECTFP6-036425 Radioprotection of the environment in France: IRSN current views and workplan K....
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Radioprotection of the environment in France: IRSN current views and workplan
K. Beaugelin-Seiller, IRSN
Vienna IC, 27-29 June 2007
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Our involvment The national context
IRSN = technical support of the French national authority
Research programmes and studies on health and environmental radiological risks
=> foundation to ensure a high quality of our workCurrently, wide research programme devoted to radiological chronic risks for human health and environment (ENVIRHOM) Operational issues in combination
Conception/improvement of risk assessment methodsConception/improvement of models and associated parameters
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Our involvment The international context
EC projects: FASSET (2001-2004)
ERICA (2004-2007): risk characterisation (theoretical & experimental aspects)
PROTECT (2006-2008): concept review and method applicability
FUTURAE (2006-2008): feasibility of a network of excellence in radioecology
ICRP: comittee 5
IAEA: EMRAS BWG (2005-2007), action plan…
UNSCEAR
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The ERICA approach The 4 steps classical and consensual approach
human and non-human, chemicals and radionuclides
Three tiersTier 1: screening
Tier 2: generic assessment
Tier 3: site-specific assessment
Some limitationsFinite list of radionuclides (in 2005, but not more true)
Finite list of exposure scenarios
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« ERA » for the French NPPs A source term well defined
Radionuclides absent from the initial ERICA list
Annual releases known
Dilution conditions
Release characteristics
Temperate ecosystems (FW, SW and T)
Water and air
Chronic (routine) or acute (accident)
Possible underestimation of the radiological risk/ERICA
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Our solution A method (initiated in 2005)
Limited to screening Exposure: unified dosimetric calculation, wathever the ecosystem and the organism (EDEN)Effects: SSDsBackcalculation of concentrations in media (air, soil/sediment, water) for the 95% percentile of exposure
A tool, CARREN (av. end of 2006)
Excel fileimmediate access and results
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SCREENING general menu
Terrestrial ecosystem
Marine ecosystem
Freshwater ecosystem
Terrestrial ecosystem
Marine ecosystem
Freshwater ecosystem
Terrestrial ecosystem
Marine ecosystem
Freshwater ecosystem
Terrestrial ecosystem
Marine ecosystem
Freshwater ecosystem
Chronic exposureAcute exposure
Weighted dose conversion coefficients (relative biological effectiveness of and radiation included)
customised dose and dose rate only
Non weighted dose conversion coefficients
About CARREN
SCREENING: risk assessment through comparison between exposure concentrations and reference no effect concentrations (tabulated values)
objectives
Methodology principles
application area
Calculation
Select the ecosystem in association with
the adapted calculation conditions
* Tool not yet available in English, screen translated for the meeting needs
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Calculation conditions
Results risk per media risk (RN, organism)
Limiting organisms
Input data dosimetric benchmark media concentrations
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Data gaps and limitationsScreening approach
Conservative approachEquilibrium assumption
Use of Kds and CRs
Based on available data Size of data set (exposure as well as effects) highly dependent on:
The radionuclides
The organisms
ERICApresent knowledge: robust ERA possible for RNS
But gaps on fate within ecosystems and effects of RNs on NHBExperimentation: fate and effects for chronic low-level RN exposure for NHB
Extrapolations
If not passed?
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SolutionsKey issue Effect analysis
acute-high dose vs. chronic-low dose rate Desktop study: Acute to Chronic Ratio (ACR) derivation on the basis of effect data for a given wildlife group (eg vertebrates, invertebrates, plants).
external vs. internal Experimental refinement also combined with statistical analysis of existing Relative Biological Effectiveness per type of effects.
One species to another Desktop study: Species Sensitivity Distribution among a given trophic level or wildlife community (e.g. fish).
Individual vs. population Experimental refinement also combined with population dynamic modeling.
Population vs. higher organizational levels Desktop study: Prey-predator interaction modeling and/or safety factors
Single RN vs. multi-contaminants Experimental refinement for mixtures and to delineate the relative contribution of chemical toxicity and radiological toxicity for radioactive substances with low specific activity (e.g. U)
Intra-generational to multigenerational Experimental refinement coupled with quantitative genetic analysis to evidence adaptative responses of chronically exposed populations.
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SolutionsIRSN R&D 2007
Mining context (screening level)Chemotoxicity and radiotoxicity
Comparative risk: concepts and method
Dosimetric calculationEDEN 1.5 available free of charge since september 2005
EDEN 2.1 available in 2007
Possible upgrade in 2007
FREDERICA data treatmentTo update SSDs with new data
To mathematically process data previously ignored as exhibiting hormetic pattern
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PublicationsEDEN: Health Physics, 90 (5): 485-493
Comparative risk:-SETAC 21-26 may 2007- paper in 2007
U ore mining- paper in 2007