Measuring Norwegian reindeer radiation exposure under ...Phakphum Aramrun (Moo) Supervisors : Dr Mike Wood, Prof Nick Beresford, Prof Robert Young. Overview direct dosimetry measurements

Measuring Norwegian reindeer radiation exposure under field conditions

Phakphum Aramrun (Moo)

Supervisors : Dr Mike Wood, Prof Nick Beresford, Prof Robert Young

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

Models & approaches

validate

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 DAtafor Radiological Impact Assessment

(MODARIA)

Chernobyl accident

Experiment site

Activity depositions of Cs-137 in soil in 1986(data from NRPA)

Vågå

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)

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)

Al2O3: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

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)

Assembly dosimeters in aluminium box

Box

Lid

Aluminium plateTLD

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**

Field work

15 reindeers have been attached

dosimeter boxes for 12

months

Video clip at the field

Field experiment

Vågå Norway11 Jan 2016

• 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

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.

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

Sponsors & supporters

Thank you very much