1. Measuring Norwegian reindeer radiation exposure under field conditions Phakphum Aramrun (Moo) Supervisors : Dr Mike Wood, Prof Nick Beresford, Prof Robert Young

2. Overview direct dosimetry measurements of wild organisms in the field ERICA RESRED E.D.E.N. No published data on radiation effects combined with direct external dose measurements using appropriate dosimeters under field conditions Example of direct dose measurement study Models & approaches validate

3. Overview Norwegian Radiation Protection Authorities (NRPA) and Vågå herder: study the movement of reindeer through contaminated areas Develop direct dose measurement technologies and validate external dose rates of models The IAEA’s programme on MOdelling and DAta for Radiological Impact Assessment (MODARIA) Chernobyl accident

4. Experiment site Activity depositions of Cs-137 in soil in 1986 (data from NRPA) Vågå

5. Field experiment NRPA and Vågå herder 21 reindeers have been attached GPS collars (tracking the movement of reindeer in real-time) Reindeers mounted GPS collars are monitored cs-137 activity concentration two times/year (January & September)

6. Why these technologies have been chosen? Direct dose measurement ●Passive dosimeters have been used to measure external dose of reindeer during a year ●4 types of dosimeters have been selected for the measurement  Thermoluminescence dosimeter (TLD)  (LiF:Mg,Cu, P) – Public Health England  Optically Stimulated luminescence dosimeter (OSLD)  Al 2 O 3 :C – Thailand Institute Nuclear Technology  Radiophotoluminescence dosimeter (RPLD)  Phosphate glass – Chiyada Technal Corporation  Instadose 2 (Direct Ion Storage, DIS) – Mirion Technologies TLD (LiF:Mg,Cu, P) OSLD RPLD Instadose 2 Please see … my poster!!! Dosimetry technology for measuring external radiation exposure of Norwegian reindeer

7. Design of dosimeter mounted on GPS collar -Aluminium enclosure have been chosen to fit dosimeters in due to robust, waterproof, small size and light weight GPS collars designed by NRPA & Vågå herder Good point to fit dosimeters on the side of the collar -Balance -Do not need to change structure of the collar (e.g. counterbalance) (but need a box to assemble dosimeters)

8. Assembly dosimeters in aluminium box Box Lid Aluminium plate TLD RPLD foam OSLD foam Instadose 2 Silica gel 22 boxes have been assembled **Dosimeters need to be assembled in boxes in Norway to avoid scanning of x-ray at airport**

9. Field work 15 reindeers have been attached dosimeter boxes for 12 months

10. Video clip at the field Field experiment Vågå Norway 11 Jan 2016

11. 4 dosimeter boxes have been fitted at weather station control & investigate factors which may influence detector performance 3 dosimeter boxes have been stored at NRPA control transit doses Field work

12. Result of the experiment compare data from four dosimeters collected over a year assess dosimeter performance and suitability for environmental use validate external absorbed dose rates predicted by computer models.

13. What to do next? Develop reindeer phantom Measuring radiation exposure of reindeer phantom by using collars mounted dosimeter box in Laboratory Work with Public Health England (PHE) to calibrate dosimeters boxes on the collars Running calibration test with dosimeters set up on collar Investigate factors which may influence detector performance Temperature, humidity, snow depth, etc. Collect dosimeters from reindeer collars in Vågå Norway January 2017

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