DOE’s Technical Standard for Evaluating Radiation Doses to Biota: Overview of the Graded Approach Biota Dose Assessment Committee Meeting Washington, DC.
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DOE’s Technical Standard for
Evaluating Radiation Doses to Biota:
Overview of the Graded Approach
DOE’s Technical Standard for
Evaluating Radiation Doses to Biota:
Overview of the Graded ApproachBiota Dose Assessment Committee Meeting
Washington, DC
August 18 - 20, 1999
- Stephen Domotor - Environmental Policy and Assistance
Air, Water and Radiation Division (EH-412)
Presentation OutlinePresentation Outline
Guiding Principles for Methods Development
Biota Dose Assessment Committee
Process Employed in Methods Development
DOE’s Graded Approach for Compliance
Biota Manual, Spreadsheets, and Database
Issues and Opportunities
Path Forward
Guiding Principles for DOE Methods Development
Provide a graded approach for multiple users
Easy to use and technically sound
Utilize existing generic and site-specific data
Applicable to multiple media
Incorporate eco-risk framework
Interdisciplinary team approach
Provide leadership in methods development
Biota Dose Assessment Committee
Formed June 1998 under DOE’s Technical Standards Program
An interdisciplinary team (health physics; radioecology; dose assessment; environmental monitoring)
Broad representation (DOE sites; labs; universities)
DOE focal point for biota dose assessment
Primary role in Biota Manual development
Advisory role to Program and Operations Offices
Web Site http://tis-nt.eh.doe.gov/oepa/public/bdac
BDAC Technical Standard Writing GroupBDAC Technical Standard Writing Group
Ernie Antonio (Pacific Northwest National Lab)
Gordon Bilyard (Pacific Northwest National Lab)
Steve Domotor (Dept. of Energy)
Gary Friday (Westinghouse Savannah River Co.)
Kathy Higley (Oregon State Univ.)
Dan Jones (Oak Ridge National Lab)
Dave Kocher (Oak Ridge National Lab)
Brad Sample (CH2M Hill)
A Process That Involves Users and Developers of the Method A Process That Involves Users and Developers of the Method
A consensus-based process
BDAC Core Team prepared the strawman
Full BDAC review at each phase
Selected outside reviewers
Issues resolved via conference calls & Web Site
ISCORS inter-agency coordination initiated
BDAC workshop to pilot and refine the method
DOE Technical Standards Approval Process
DOE’s Graded ApproachDOE’s Graded Approach
Compare mediaconcentrations with BCGs
1 DataAssembly
2 GeneralScreening
Site-representative parameters
3 AnalysisSite SpecificScreening
Site SpecificAnalysis
Site SpecificBiota DoseAssessment
Kinetic modeling tool
Eco-risk framework
Receptors Used in Deriving the Screening MethodologyReceptors Used in Deriving the Screening Methodology
BCGs
aquatic riparian terrestrial terrestrial
animal animal animal plant
Biota Concentration GuidesBiota Concentration Guides
Biota Manual
USING THE GRADED APPROACH (user-friendly)
– Applications and Exclusions
– Look-up tables and Step-by-Step Guidance
APPENDICES (detailed references and technical basis)
– Time averaging and spatial variability
– Biota sampling methods
– Default parameter values
– Derivation of screening and kinetic model equations
– Radiation weighting factor for alpha particles
User Friendly SpreadsheetsUser Friendly Spreadsheets
Encodes Method– Microsoft Excel®
– Visual Basic®
Automated CalculationsAutomated Calculations
Site-Specific ModificationsSite-Specific Modifications
Helpful Reference NotesHelpful Reference Notes
A Web-Accessible DatabaseA Web-Accessible Database
Supports DOE approach and other methods
Contains parameter data (Kds; Bivs) & references
Users can add, edit and search for data remotely
Users can search by multiple attributes:– nuclide; parameter, taxonomic group, organism type, soil
type, reference
A prototype is available within the BDAC
Issues and OpportunitiesIssues and Opportunities
Technical -
– Radiation weighting factor for alpha-emitters
– Vertical transport of radionuclides by plants: considerations for soil sampling
– Adjustments for size of contaminated zone and organism home range
– Compilation and “benchmarking” of models and methods
– Risk management options following an indication that dose limits are potentially exceeded
Interest and Support -
– Strong interest from the radioecology community, local regulators, private sector, and internationally
Successes and a Path Forward for Continued Progress
Early Work Oct 1996 and Dec 1997 trial approaches
Jun 1998 BDAC Formed
Dec 1998 Draft Biota Manual/new method completed
Jan 1999 IAEA Technical Committee Meeting
Jan - Feb 1999 Biota Manual reviewed within BDAC
Jan - Jul 1999 Refine and pilot (5/99) database
Mar - Apr 1999 Assess and resolve comments
Apr - Jul 1999 Refine spreadsheets and Biota Manual
May 1999 International Symposium (Canada)
Jun 1999 Health Physics Society Annual Mtg.
Aug 1999 BDAC Meeting/Workshop
Sep - Oct 1999 Final Biota Manual to DOE TSP/External
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