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MODARIA II
Working Group 2
Assessment of Exposures and
Countermeasures in Urban Environments
Kathleen Thiessen, Ph.D.
Oak Ridge Center for Risk Analysis, Inc.
21-24 October 2019
MODARIA II
Vienna
MODARIA II, Urban Exposures Working Group
• First meeting of WG2 in fall 2016
– 26 participants, 20 countries
• Second meeting of WG2 in May 2017
– 16 participants, 14 countries
• Third meeting of WG2 in October-November 2017
– 24 participants, 16 countries
• Fourth meeting of WG2 in April 2018
– 15 participants, 13 countries
• Fifth meeting of WG2, October 2018
– 20+ participants, 17 countries
• Sixth meeting of WG2 in April 2019
– 15 participants, 12 countries
• Seventh meeting of WG2 this week
– 23+ participants, 19 countries
Objective of the Urban Working Groups
• To test and improve the capabilities of models
used in the assessment of radioactive
contamination in urban environments– Dispersion and deposition events
– Short-term and long-term contaminant redistribution
following deposition events
– Effectiveness of potential countermeasures or remediation
efforts for reducing contamination levels, human exposures,
and doses
• Significance: improved support of decision
making and communication with the public– Planning (“What if. . . ?”)
– Response (e.g., comparison of remediation strategies)
Summary of WG2 Activities
• Short-range atmospheric dispersion exercises
– Boletice (new field test)
– Munich (hypothetical urban dispersion)
• Mid-range atmospheric dispersion exercises
– Šoštanj (Case 3, tracer exercise)
– Meteorological forecasting
– Chalk River (Ar-41 data set)
• Dose assessment exercise
– Fukushima
• Other activities
– Updates on related exercises (Casaccia, NERIS,
ASEAN benchmark modelling)
– Literature review, model review
Short-range Atmospheric Dispersion:
Boletice (field test)
Short-range Atmospheric Dispersion:
Munich (hypothetical urban dispersion)
Mid-range Atmospheric Dispersion:
Šoštanj Exercise (Case 3)
Mid-range Atmospheric Dispersion:
Weather Forecast Validation
27-28 July 2008
Mid-range Atmospheric Dispersion:
Chalk River Ar-41 Exercise
Urban Contamination and Remediation:
Fukushima exercise
Additional Activities
• Updates on related activities
– Modelling for Italian plant Casaccia
– NERIS experiment
– Southeast Asia benchmark modelling
Initial Literature Review
• Urban building
materials
– Retention,
penetration,
weathering
– Concrete and
asphalt
Continuation from MODARIA
• Model review
–Additional models
–Updates for some models
WG 2: MODARIA II report
Section Topic Lead Author Timescale
1 Introduction K Thiessen Dec 2019
2 Boletice exercise (field test) K Thiessen Jan 2020
3 Munich exercise (hypothetical) L Patryl, H Walter May 2020
4 Šoštanj exercise, case 3 (tracer) M Boznar, P Mlakar early 2020
5 Forecasting modelling M Boznar, P Mlakar early 2020
6 Chalk River (Ar-41 data set) M Pattantyús-Ábrahám early 2020
7 Related exercises (NERIS,
Casaccia, ASEAN)
H Walter, F Mancini, K Silva early 2020
8 Fukushima exercise S Takahara early 2020
9 Literature review (not definite) E Sim mid-2020
10 Summary, appendices K Thiessen mid-2020
Draft report for WG review Sections as prepared; full report, mid-2020
Draft report for IAEA review mid-2020
Proposed Title: Assessment of radioactive contamination,
exposures, and countermeasures in urban environments
Thank you!