Radiological Habits Survey: Hunterston 2017 ++++++++++++++++++++++++++++++++++++++ Radiological Habits Survey: Hunterston 2017 1 Radiological Habits Survey: Hunterston 2017 Radiological Habits Survey: Hunterston 2017 Authors and Contributors: I. Dale; P. Smith; A. Tyler; D. Copplestone; A. Varley; S. Bradley; P Bartie; M. Clarke and M. Blake External Reviewer: A. Elliot 2 Radiological Habits Survey: Hunterston 2017 This page has been left blank intentionally blank 3 Radiological Habits Survey: Hunterston 2017 Contents Contents ............................................................................................................................... 4 List of Abbreviations and Definitions ..................................................................................... 9 Units ..................................................................................................................................... 9 Summary ............................................................................................................................ 10 1. Introduction ............................................................................................................. 14 1.1 Regulatory Context .................................................................................................. 14 1.2 Definition of the Representative Person ................................................................... 15 1.3 Dose Limits and Constraints .................................................................................... 16 1.4 Habits Survey Aim ................................................................................................... 16 2 The Survey .............................................................................................................. 18 2.1 Introduction ............................................................................................................. 18 2.2 Site Activity .............................................................................................................. 18 2.2.1 Current On-Site Activity ........................................................................................... 18 2.2.2 Off-Site Activity ........................................................................................................ 19 2.3 Estimated Activity Concentrations from Licensed Discharges from Hunterston A and Hunterston B ....................................................................................................................... 19 2.4 Survey Areas ........................................................................................................... 22 2.5 Land Cover Data ..................................................................................................... 23 2.6 Soil Data .................................................................................................................. 27 2.7 Topographic Wetness Index .................................................................................... 29 2.8 Agricultural Production ............................................................................................ 31 3 Methods .................................................................................................................. 33 3.1 Introduction ............................................................................................................. 33 3.2 Postal Survey .......................................................................................................... 34 3.3 Radiometric Surveys ............................................................................................... 34 3.3.1 In-Situ Dosimetry ..................................................................................................... 34 3.3.2 Beta Dosimetry ........................................................................................................ 34 3.4 GPS Tracking .......................................................................................................... 35 3.5 Conduct of the Survey ............................................................................................. 35 3.6 Meetings and Informal Contacts .............................................................................. 35 3.7 Data Conversion & Analyses ................................................................................... 36 3.8 Data Rounding and Grouping .................................................................................. 36 3.9 Qualitative and Quantitative Observations ............................................................... 38 4 Radiological Habits Survey: Hunterston 2017 3.10 Dose Assessment Tool ............................................................................................ 39 4 Postal Survey .......................................................................................................... 41 4.1 Introduction ............................................................................................................. 41 5 Aquatic Radiation Pathways .................................................................................... 43 5.1 Introduction ............................................................................................................. 43 5.2 Aquatic Survey Area Descriptions ........................................................................... 43 5.2 Commercial Seafood Operations ............................................................................. 43 5.3 Non-Commercial Fishing and Angling ..................................................................... 45 5.5 Wildfowling .............................................................................................................. 45 5.6 Royal National Lifeboat Institute .............................................................................. 46 5.7 Sailing and Rowing .................................................................................................. 46 5.8 Diving Clubs ............................................................................................................ 48 5.9 Professional Dog Walkers ....................................................................................... 48 5.10 Ramblers/Walking ................................................................................................... 48 5.11 Animals Grazing ...................................................................................................... 49 5.12 Seaweed and Foraging ........................................................................................... 49 5.13 Phase 1 Survey Results: Internal Exposure ............................................................. 51 5.13.1 Introduction .......................................................................................................... 51 5.13.2 Adult Consumption Rates .................................................................................... 51 5.13.3 Children and Infant Consumption Rates .............................................................. 53 5.14 Phase 1 Survey Results: External Exposure........................................................... 54 5.14.1 Adult External Exposure ........................................................................................... 54 5.14.2 Children and Infants External Exposure ............................................................... 56 6. Terrestrial Radiation Pathways ................................................................................ 58 6.1 Introduction ............................................................................................................. 58 6.2 Terrestrial Survey Area ............................................................................................ 58 6.3 Private Food Production .......................................................................................... 58 6.3 Commercial Food Production .................................................................................. 59 6.4 Wild Foods .............................................................................................................. 60 6.5 Production of Honey ................................................................................................ 61 6.6 Poultry ..................................................................................................................... 62 6.7 Farms ...................................................................................................................... 63 6.8 Other Pathways ....................................................................................................... 63 6.9 Internal Exposure - Phase 1 .................................................................................... 64 6.9.1 Adult Internal Exposure ........................................................................................... 64 6.9.2 Children and Infant Internal Exposure ..................................................................... 66 6.9.3 GPS Survey Results .................................................................................................. 67 5 Radiological Habits Survey: Hunterston 2017 7 Direct Radiation Exposure ....................................................................................... 69 7.1 Introduction ............................................................................................................. 69 7.2 Mobile Gamma Spectrometry Survey .....................................................................