Testing of environmental transfer models using data from the

3,07

MB

atmospheric release of Iodine-131 from the Hanford site, USA, in

185

stron

1963

4681

ID

International Atomic Energy Agency

2003

rok

CONTENTS

SUMMARY 1

1. INTRODUCTION 3

1.1. Background and overall objectives of BIOMASS 3

1.2. Theme 2: Environmental releases . 3

1.3. Background on dose reconstruction 4

1.4. Initial case in dose reconstruction: Hanford scenario . 5

1.4.1. Background . 5

1.4.2. Scenario description 6

1.4.3. Assessment tasks. 8

1.5. Structure of the report . 9

2. PARTICIPANTS AND MODELS . 9

3. SUMMARY AND DISCUSSION OF RESULTS . 13

3.1. Atmospheric transport. 14

3.2. Deposition . 14

3.3. 131I concentrations in vegetation . 15

3.4. 131I concentrations in milk. 15

3.5. Intake of 131I by humans 16

3.6. Thyroid burdens 16

3.7. Dose estimates. 16

3.7.1. External doses (cloud and ground) 16

3.7.2. Inhalation doses. 17

3.7.3. Ingestion doses 17

3.7.4. Total dose 18

4. MAJOR FACTORS AFFECTING MODEL PREDICTIONS. 18

5. UNCERTAINTY ESTIMATION.19

6. CONCLUDING REMARKS19

REFERENCES 43

ANNEX I: SCENARIO DESCRIPTION. 45

I–1. INTRODUCTION 45

I–2. INPUT INFORMATION 45

I–2.1. Iodine chemical form 45

I–2.2. Meteorological data. 45

I–2.3. Measurements of 131I in the environment . 46

I–2.3.1. Vegetation samples 46

I–2.3.2. Air samples 47

I–2.3.3. Milk samples 47

I–2.3.4. Additional potentially useful tables of data . 48

I–3. ASSESSMENT TASKS . 48

I–3.1. Calculations for model testing 48

I–3.2. Calculations for comparison of dose predictions 48

I–3.3. Dispersion contours (optional) 49

I–4. AGRICULTURAL DATA 72

References . 75

ANNEX II: INDIVIDUAL EVALUATIONS OF MODEL PERFORMANCE

II–1. LIETDOS-FILTSEG. 79

V. Filistovic, T. Nedveckaite

II–2. OSCAAR 94

T. Homma, Y. Inoue, K. Tomita

II–3. TAM DYNAMIC 114

B. Kanyár, Á. Nényei

II–4. CLRP 119

P. Krajewski

II–5. THE “TYPHOON” MODEL 155

A. Kryshev

II–6. ESTIMATIONS PERFORMED AT INSTITUTE FOR ENERGY TECHNOLOGY, NORWAY. 163

U. Tveten

ANNEX III: SUMMARY OF MODEL PREDICTIONS 169

CONTRIBUTORS TO DRAFTING AND REVIEW 183