Radiological Habits Survey: Dumfries and Galloway Coast 2017 Radiological Habits Survey: Dumfries & Galloway Coast 2017 1 Radiological Habits Survey: Dumfries and Galloway Coast 2017 Radiological Habits Survey: Dumfries & Galloway Coast 2017 Authors and Contributors: P. Smith, I. Dale, A. Tyler, D. Copplestone, A. Varley, S. Bradley, P Bartie, M. Clarke and M. Blake External Reviewer: A. Elliot 2 Radiological Habits Survey: Dumfries and Galloway Coast 2017 This page has been left intentionally blank 3 Radiological Habits Survey: Dumfries and Galloway Coast 2017 Table of Contents List of Abbreviations and Definitions ........................................................................ 11 Units ......................................................................................................................... 12 Summary .................................................................................................................. 13 1. Introduction ........................................................................................................ 17 1.1 Regulatory Context ..................................................................................... 17 1.2 Definition of the Representative Person ...................................................... 18 1.3 Dose Limits and Constraints ....................................................................... 18 1.4 Habits Survey Aim ....................................................................................... 19 2 The Survey ........................................................................................................ 20 2.1 Introduction ................................................................................................. 20 2.2 Defining the Survey Area ............................................................................ 20 2.2.1 The Fate of Radioactivity in the Coastal Area of Dumfries and Galloway 20 2.3 The Survey Area ......................................................................................... 23 2.4 Land Cover Data ......................................................................................... 23 2.5 Soil Data ..................................................................................................... 26 2.6 Topographic Wetness Index ....................................................................... 26 3 Methods ............................................................................................................. 28 3.1 Introduction ................................................................................................. 28 3.2 Radiometric Surveys ................................................................................... 29 3.2.1 In situ Dosimetry ................................................................................... 29 3.2.2 Beta Dosimetry ..................................................................................... 29 4 Radiological Habits Survey: Dumfries and Galloway Coast 2017 3.3 GPS Tracking .............................................................................................. 29 3.4 Conduct of the Survey ................................................................................. 30 3.5 Meetings and Informal Contacts .................................................................. 30 3.6 Data Conversion & Analyses ....................................................................... 31 3.7 Data Rounding and Grouping...................................................................... 31 3.8 Qualitative and Quantitative Observations .................................................. 32 3.9 Dose Assessment Tool ............................................................................... 33 4. Aquatic Radiation Pathways .............................................................................. 35 4.1. Introduction ................................................................................................. 35 4.2. Aquatic Survey Area Descriptions ............................................................... 35 4.3 Commercial Seafood Operations ................................................................ 36 4.4 Chandlery and Boat Salvaging .................................................................... 38 4.5 Food Processors ......................................................................................... 39 4.6 Local Food Retailers ................................................................................... 40 4.7 Saltmarsh Grazing ...................................................................................... 41 4.8 Net Fishing .................................................................................................. 42 4.9 RNLI & Coastguard ..................................................................................... 43 4.10 Wildfowling .................................................................................................. 44 4.11 Non-Commercial Sea Angling & Shell-Fishing ............................................ 45 4.12 Wild Foraging and Seaweed ....................................................................... 46 4.13 Aquatic Sports and Activity Clubs ............................................................... 47 4.14 Wildlife and Ranger Activities ...................................................................... 49 4.15 Holiday Parks .............................................................................................. 50 4.16 Phase 1 Survey Results: Internal Exposure ................................................ 52 4.16.1 Introduction ....................................................................................... 52 5 Radiological Habits Survey: Dumfries and Galloway Coast 2017 4.16.2 Adult Consumption Rates .................................................................. 52 4.16.2 Children and Infant Consumption Rates ............................................ 54 4. 17 Phase 1 Survey Results: External Exposure ............................................... 56 4.17.1 External Exposure ............................................................................. 56 4.18 GPS Tracking .............................................................................................. 61 5 Direct Radiation Exposure ................................................................................. 62 5.1 Introduction ................................................................................................. 62 5.2 Survey Area ................................................................................................ 62 5.3 MoGGS Survey Results .............................................................................. 65 5.4 In-Situ Gamma Dosimetry ........................................................................... 67 5.5 In-Situ Beta Dosimetry ................................................................................ 71 5.6 Occupancy Rates ........................................................................................ 73 5.6.1 Occupancy Data for Survey Area ......................................................... 73 6. Phase 2 Survey Results .................................................................................... 76 6.1 Introduction ................................................................................................. 76 6.2 Phase 2 Internal Exposure .......................................................................... 77 6.2.1 Internal Aquatic ..................................................................................... 77 6.3 Phase 2 External Exposure ............................................................................. 77 6.3.1 Aquatic/Intertidal Activities .................................................................... 77 6.3.2 Handling Equipment or Sediment ............................................................. 78 7 Comparisons with Previous Survey ................................................................... 79 7.1 Introduction ................................................................................................. 79 7.2 Internal Exposure Comparison .................................................................... 79 6 Radiological Habits Survey: Dumfries and Galloway Coast 2017 7.2.1 Adult Consumption Rates ..................................................................... 79 7.2.2 Children and Infants Consumption Rates ............................................. 80 7.3 External Exposure ....................................................................................... 82 7.3.1 Adult Intertidal Activities........................................................................ 82 7.3.2 Children and Infants Intertidal Activities ................................................ 83 7.3.3 Adult Aquatic Activities ......................................................................... 83 7.3.4 Children and Infants Aquatic Activities ................................................. 84 7.4 Handling Equipment and Sediment ............................................................. 85 8 Dose Assessment .............................................................................................. 87 8.1 Phase 1 Aquatic Radiation Pathways ......................................................... 87 8.1.1 Internal Exposure ................................................................................. 87 8.1.2 External Exposure ...............................................................................