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

▶
modaria ii
SMART_READER_LITE
LIVE PREVIEW

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

Oct 06, 2022 488 likes •761 views

MODARIA II WG 4 : Working Group 4 Transfer processes and data for radiological impact assessment Assessing the radiological impact from radioactivity in the environment We need to adequately quantify the key transfer processes and

slide-1
SLIDE 1

MODARIA II

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

slide-2
SLIDE 2

Assessing the radiological impact from radioactivity in the environment

We need to adequately quantify the key transfer processes and recognise their limitations in radiological assessments

  • improve understanding and quantification of key

processes The transfer processes and related data will vary depending on the situation considered;

  • planned, existing and emergency exposure situations
  • characteristics of the environment
  • terrestrial, freshwater, marine
  • temperate or non-temperate systems
slide-3
SLIDE 3

WG 4 report status

  • Final draft distributed before this meeting
  • Prioritising radioisotopes and data gaps
  • Kd – soils, freshwater, marine
  • Transfer to milk and to wild game in Japan
  • Final review at TM II
  • Peer review?
  • Finished!
slide-4
SLIDE 4

WG4: Objectives for three sub groups

  • To identify key transfer processes for

radioactivity in the environment, in the context

  • f the situation under consideration, for use in

radiological impact assessment and to provide analysis of key relevant data. Current Focus on Kd

  • To consider the impact of the accidental release

from the Fukushima Dai-ichi site in Japan in 2011 and the applicability of existing models and data to the Japanese situation.

  • To provide advice on the applicability of

assessment models to tropical, semi-tropical and arid environments.

slide-5
SLIDE 5

Relevance to regulatory goals of IAEA

Human and environmental radiological protection in situations of regular operational activities and in accidental scenarios. WG4 is working toward:

  • Strengthening evaluation of the radiological impact by

improving the data underpinning the models developed for assessing the transfer of RNs in the environment and the radiological impact

  • To more appropriately assess exposure levels of the

public and in the environment - to ensure an appropriate level of protection from the effects of ionizing radiation, associated with radionuclide releases and from existing radionuclides in the environment

slide-6
SLIDE 6

MODARIA II WG4

Revision and Improvement of Kd Values for Terrestrial, Freshwater and Marine Systems

slide-7
SLIDE 7

Review of IAEA MARiS (Marine Information System) Database

  • Feasibility of using

MARiS database as global repository of Kd data investigated.

  • MARiS has the

potential to generate Kd values.

  • Preliminary

Investigations underway.

slide-8
SLIDE 8

Preliminary Investigations in MARiS database

  • Baltic Sea Case Study
  • Generated Kd values using seawater and sediment activity

concentration data for Cs-137.

  • Difference in Kd values for sediment and suspended solids.
  • Further investigations to begin in Nov 2017 (IRSN).

Sample Type TRS 422 Reference Kd Value Calculated Kd Value

Bottom Sediment

4 x 103 5 x 103

Suspended Matter

5 x 104

slide-9
SLIDE 9

Development of global database of Kd values

  • Harmonisation of soil, freshwater and marine data

required.

  • Requires Kd data and other relevant meta-data to be

collated i.e. information on soil/sediment/seawater etc.

  • Prototype database developed – testing required.
slide-10
SLIDE 10

Interim Meeting Monaco 31st May – 2nd June 2017 - Presentations

slide-11
SLIDE 11

Joint work with MODARIA II WG7

  • Discussions with WG7 on
  • How Kd values are used in marine modelling.
  • How they are handled in equilibrium and dynamic

situations.

  • What radionuclides and situations are of primary

concern from a marine modelling point of view.

  • Further collaboration with WG7 utilizing experimental

Kd values in marine models (once data is published)

slide-12
SLIDE 12

WG4 sub-group

Collation of environmental transfer parameters after the Fukushima accident

(Fukushima parameters)

1st Interim meeting @ University of Tsukuba, 10-12 July, 2017

slide-13
SLIDE 13

As Asso sociate e exper perts

Japanese research group leaders River+Freshwater biota: S. Hayashi (NIES) Catchments: Y. Onda (Tsukuba Univ.) Marine: H. Takata (MERI) Rice: H. Tsukada (Fukushima Univ.) Agricultural crops: T. Shinano (NARO) Forest: S. Hashimoto (FFPRI) Game animals, & Food processing: K. Tagami (QST)

International experts

River+Catchment: UK, France Marine: Australia, UK, Korea Rice+ Agricultural Crops: Italy, UK Forest: France, UK Game animals: UK, Australia Food processing: Germany Datasets: All

slide-14
SLIDE 14

Fuk Fukushima da datasets: s: a sho hort r repo eport f from the i he inter erim m mee eeting

  • Time series [RCs] data in marine, river, forest, and catchments and possible transfer

mechanisms in these compartments presented.

  • Change with time in Concentration ratio (CR) or Tag for marine and freshwater fish

and game animals presented.

  • Examples of transfer factors (TFs) of RCs in agricultural products, incl. rice, reported.

Application of K fertilizer to arable land is key remediation action so info on K application and TFs would be combined in the datasets. Need to explore whether similar datasets are available from the Chernobyl accident to allow comparison.

Catchment Marine River Forest

Agricultural product Rice paddy field Game

Food processing

slide-15
SLIDE 15

1 10 100 1000 10000

Black rockfish (クロソイ）

CR value changes with time for four marine fish species

(before and after the Fukushima Daiichi NPP accident, off Fukushima)

Effective half lives (2012 (peak year) and after) were obtained using exponential fitting curves

1 10 100 1000

Greenling (アイナメ)

1 10 100 1000 10000

Japanese flounder (ヒラメ)

1.00 10.00 100.00 1000.00 10000.00

Conger-eel (マアナゴ)

Effective half-life: 350 days Effective half-life: 360 days Effective half-life: 300 days Effective half-life: 580 days

slide-16
SLIDE 16

Geographical distributions

4197 records from 61 journal papers and 2 reports (preliminary) (No location (latitude and longitude) Information for 781 records )

Forest data updates

200 400 600 800 1000 1200 1400 2011 2012 2013 2014 2015 2016

Animal Soil Tree 203 166 5264

2011-2012: Tree > Soil >> Animal 2013- : Soil > Tree >> Animal

Sampling year Records

Total (N)

Records: animal, soil and tree

slide-17
SLIDE 17

This week

  • Check ecosystems/areas for which datasets will

be compiled (nearly finished).

  • Update data for forest, marine, catchments and

food processing.

  • Discuss radiocaesium fate in Japanese forest

ecosystems incl. potential parameters to be reported, e.g. translocation in tree and transfer to mushrooms.

  • Discuss dataset compilation and application
  • Discuss table formats to be included in Tecdoc

from databases.

slide-18
SLIDE 18

MOD ODARI RIA I II

WG4 Sub-group “Transfer Parameters in Non-temperate Systems”

slide-19
SLIDE 19

Joint w work wi with h IUR

slide-20
SLIDE 20

TF for non-temperate and arid environment

Objective

slide-21
SLIDE 21

Development of database

Over 200 publications in 23 countries with arid climates collated:

  • newly published or available information in

scientific journals

  • information delivered by members of the group

such as S. Lukashenko PhD thesis on Kazakhstan, PhD student work from Nigeria and South Africa.

  • consideration of quality factors
slide-22
SLIDE 22

Current dataset status

Country Radionuclide Soil type Plant Group Plant compartment Soil pH Location Climate Concentration in Soil (Bq/kg dw) Concentration in Plant (Bq/kg dw) Food Quality Factor (1-4) Comment Information source info Calculated TF Transfer Factor (GM) GSD TF Minimum TF maximum

Excel dataset with > 250 records

slide-23
SLIDE 23
  • Mr. Wu (China)

Radiation monitoring and radioecological impact assessments of in the Tsinghua University in Beijing

  • K. Eleftheriadis (Greece)

Results of air born radioactivity, resuspension and dispersion modelling

  • K. Kehagia (Greece)

Results of U-238/U-234 and Ra measurements in seawater, surface river water and freshwater from her monitoring studies

  • H. Florou (Greece)

Latest results on concentration ratios in natural biota

  • N. Semioshkina (Germany)

Report on consumption habits and agricultural practices in Arab countries

  • S. Fesenko (IAEA)

First results with significantly higher TFs Cs-137/Sr-90 in tropical environments, compared to tendentially lower TFs in subtropical environments

slide-24
SLIDE 24

Factors affecting food consumption in arid countries

1.Socio-cultural and economics environment 2.Urban/Rural differences 3.Geographical differences 4.Religious differences 5.Others

slide-25
SLIDE 25

Dietary habits of people in the Arab world

slide-26
SLIDE 26

This week – order of sub topics

  • Briefing on interim meetings and final report review
  • Terrestrial, freshwater and marine Kd
  • Fukushima data
  • Non-temperate systems