MODARIA II WG4 : Working Group 4 Transfer processes and data for - - PowerPoint PPT Presentation

MODARIA II

WG4 :

Working Group 4 – Transfer processes and data for radiological impact assessment

Three sub groups

• Kd datasets
• Fukushima data
• Non‐temperate transfer parameters

WG 4 report status

• Significant improvements to draft Report
• Prioritising data gaps
• Kd – soils, freshwater (marine)
• Transfer to animal products and to wild game in Japan
• Specified text queries to sub chapter authors t return by

end Nov

• WG leader review, peer review
• Finalise early 2017

Marine Kd activities in MODARIA

• Critical Review of IAEA TRS‐422
• Discussed derivation of previous Kd value compilations
• Discussed MARiS
• Presented various Japanese data:
• Factors influencing variability of marine Kd data
• Apparent or time dependent Kd values after Fukushima

Current marine Kd info in MODARIA report

• Factors influencing variability of marine Kd data:
• Use of stable element data v. global fallout data
• Sediment characteristics
• Sedimentation rate
• Exchangeable fraction

Sr Cs

Marine Kd – This week

• Discussed potential data sources
• Met with WG7 to discuss proposal
• Feedback required from WG7 on information required to use

Kd in dispersion models

• Feasibility of using MARiS database being examined
• Discussed common database approach for freshwater,

soil and marine Kd

Marine Kd – Next Steps

• Liaise further with WG7 on requirements
• Review proposed data structures for soil and freshwater

databases.

• Discuss use of MARiS with IAEA MEL, Monaco
• Start to collate data
• Develop preliminary data structure using specific

elements, e.g. Sr and Cs, and discuss at interim meeting

Fuk Fukushim shima par parameter da datase sets ts

Countries: UK, France, Korea, Germany, Japan, Australia, Austria,

• [Cs‐137] change with time (trees, herbaceous plants, freshwater and

marine biota) presented.

• Connectivity between different parts of the contaminated ecosystems.

Eg ‐ Radiocaesium loss from forested catchments, via aquatic pathways and erosion, to paddy fields and coastal areas. Catchment Marine

River Paddy field Forest

Da Data & par parameters of

• f in

interest

• Agreed that equilibrium empirical ratios given in TRS‐472 are not

appropriate for dynamic conditions of the first 3‐4 y post accident.

• Time series data are more appropriate effective half‐lives.
• Recent data on changes in empirical ratios with time indicate that RCs

released from the Fukushima accident is starting to behave like nuclear weapons fallout RCs.

1 9 8 1 9 8 5 1 9 9 1 9 9 5 2 2 5 2 1 2 1 5 2 2 10 100 1000 10000

Pacific cod, Gadus macrocephalus

CR

• Time series data (e.g. leaves,

branches, throughfall in forest ) taken soon after the accident are unique and valuable

• DATABASE: Forest database example
• recognized that QC (who inputs data

& when, who checked it & when) needs to be done

Associate experts (need volunteers!)

Rice (TF) Agricultural crops Game animals Forest River Marine Biota Fresh water Biota

WG 4

Parameter database

• Data collation
• Data analysis

Scientific contributors (world‐wide)

Japan research group leaders

River: Mr. Seiji Hayashi (NIES) Marine Biota: Mr. Hyoe Takata (MERI) Rice: Mr. Hirofumi Tsukada (Fukushima Univ.) Forest: Mr. Shoji Hashimoto (FFPRI) Game animals: Ms. Keiko Tagami (QST)

International experts

River: IAEA, UK, France, Spain, US Marine Biota: Australia, UK, Korea Rice: IAEA, UK, Germany Forest: France, UK, Germany Game animals: UK, Australia, Korea

In Interim rim me meet eting (Fuk ukushi ushima par parameter sub sub‐gr group)

• up)
• Will be held in Tsukuba, Japan, in July (the second week?).
• A Japanese experts meeting first followed by the international

meeting (as interim meeting)

• Semi‐closed; if anybody would like to attend or need information,

please contact us.

Tokyo

Venue: University of Tsukuba About 1 h from Tokyo by train About 1.5 h from Narita Airport by bus

Sub‐group: Arid, sub tropical, tropical Environments

Objectives

• 1. To contribute to improving current data of Tecdoc 1616 and TRS 472 for

transfer parameters of radionuclides to plant and animal products in these climates

• 2. To compare transfer parameters with temperate values.

A ‐ Tropical Moist Climates: all months have average temperatures above 18° Celsius. B ‐ Dry Climates: with deficient precipitation during most of the year. C ‐ Moist Mid‐latitude Climates with Mild Winters. D ‐ Moist Mid‐Latitude Climates with Cold Winters. E ‐ Polar Climates: with extremely cold winters and summers.

Climates are defined according to Köppen‐Geiger classification

• re‐analysing the underlying original datasets of TRS 472 and Tecdoc

1616, revisiting the FAO/IAEA report on transfer factors coordinated by Frissel & the IUR transfer factors databank by Mitchell

• including newly published or available information such as Lukashenko

PhD thesis on Kazakhstan, PhD student work from Nigeria and South Africa,

• Data provided by MODARIA II members (Egypt, Algeria, Australia,

Mongolia). Others?

• Requesting access to information from China, the USA and the

database created during the TC RAF 7015/7016 project.

• Other relevant national, TC and CRP data

Activities Activities will ill co comp mprise:

• Interim meeting ‐ March/April 2017 in Athens hosted by N.C.S. R.

Demokritos.

• Anticipated outputs of the subgroup are:
• Tecdoc on Radioecology in non‐temperate Environments,
• Special issue of JER
• The subgroup will cooperate with an IUR Task Force collating available

information in arid areas in Europe, Asia and Africa and Americas. An

• fficial cooperation agreement of IAEA and the IUR has been agreed.
• The subgroup will collaborate regarding relevant data in WG 5.

MOD MODARI RIA II II ‐ Wo Working Gr Group

• up 4

Sub Sub‐gr group

• up Arid

Arid En Envir vironm nmen ents ts

Thanks to

• Marcelle Phaneuf, SS MODARIA on report
• Sergey Fesenko, SS MODARIA II