Radiation dosimetry in space by means of compact passive luminescent detectors

Transcription

1 Radiation dosimetry in space by means of compact passive luminescent detectors Olivier Van Hoey, Alessio Parisi, Filip Vanhavere, Werner Schoonjans, DOSIS 3D team The Belgian Nuclear Research Center, Mol, Belgium

2 Motivation 2

3 Why do we need radiation dosimetry in space?

4 Why do we need radiation dosimetry in space? Ionizing radiation in space is one of most important health risks Dose rates more than 2 orders of magnitude higher than on earth Dose around 100 msv for 6 months ISS mission Dose up to about 1 Sv for potential manned mars mission

5 Why do we need radiation dosimetry in space? Ionizing radiation in space is one of most important health risks Dose rates more than 2 orders of magnitude higher than on earth Dose around 100 msv for 6 months ISS mission Dose up to about 1 Sv for potential manned mars mission Radiation field in space is very complex Electrons, protons, heavier nuclei, neutrons, Energies up to TeV

6 Why do we need radiation dosimetry in space? Ionizing radiation in space is one of most important health risks Dose rates more than 2 orders of magnitude higher than on earth Dose around 100 msv for 6 months ISS mission Dose up to about 1 Sv for potential manned mars mission Radiation field in space is very complex Electrons, protons, heavier nuclei, neutrons, Energies up to TeV Radiation dosimetry in space requires a combined approach Computer simulations Active and passive radiation detectors Personal dosimeters

7 Why do we need radiation dosimetry in space? Ionizing radiation in space is one of most important health risks Dose rates more than 2 orders of magnitude higher than on earth Dose around 100 msv for 6 months ISS mission Dose up to about 1 Sv for potential manned mars mission Radiation field in space is very complex Electrons, protons, heavier nuclei, neutrons, Energies up to TeV Radiation dosimetry in space requires a combined approach Computer simulations Active and passive radiation detectors Personal dosimeters

8 Passive radiation detectors

9 Passive radiation detectors

10 Stimulated luminescence detectors Optically stimulated luminescence (OSL) Thermoluminescence (TL) Sensitive for low LET radiation (< 10 kev/µm) Detection of photons, electrons, protons, muons Passive radiation detectors

11 Stimulated luminescence detectors Optically stimulated luminescence (OSL) Thermoluminescence (TL) Sensitive for low LET radiation (< 10 kev/µm) Detection of photons, electrons, protons, muons Passive radiation detectors

12 Stimulated luminescence detectors Optically stimulated luminescence (OSL) Thermoluminescence (TL) Sensitive for low LET radiation (< 10 kev/µm) Detection of photons, electrons, protons, muons Passive radiation detectors Track etch detectors Sensitive for high LET radiation (> 10 kev/µm) Detection of heavier nuclei and neutrons Labour intensive and complex analysis

13 Stimulated luminescence detectors Optically stimulated luminescence (OSL) Thermoluminescence (TL) Sensitive for low LET radiation (< 10 kev/µm) Detection of photons, electrons, protons, muons Passive radiation detectors Track etch detectors Sensitive for high LET radiation (> 10 kev/µm) Detection of heavier nuclei and neutrons Labour intensive and complex analysis

14 Methodology 14

15 TL detectors

16 TL detectors Detector types TLD Poland 6 LiF:Mg,Ti (MTS-6) and 7 LiF:Mg,Ti (MTS-7) 6 LiF:Mg,Cu,P (MCP-6) and 7 LiF:Mg,Cu,P (MCP-7)

17 TL detectors Detector types TLD Poland 6 LiF:Mg,Ti (MTS-6) and 7 LiF:Mg,Ti (MTS-7) 6 LiF:Mg,Cu,P (MCP-6) and 7 LiF:Mg,Cu,P (MCP-7) Annealing in oven

18 TL detectors Detector types TLD Poland 6 LiF:Mg,Ti (MTS-6) and 7 LiF:Mg,Ti (MTS-7) 6 LiF:Mg,Cu,P (MCP-6) and 7 LiF:Mg,Cu,P (MCP-7) Annealing in oven Reading in Harshaw 5500

19 TL detectors

20 TL intensity [au] TL detectors 7.E+04 MTS-7 Integration interval 100 C 260 C 6.E+04 5.E+04 4.E+04 3.E+04 2.E+04 1.E+04 0.E Temperature [ C]

21 OSL detectors

22 OSL detectors Detector type Landauer Al 2 O 3 :C (Luxel)

23 OSL detectors Detector type Landauer Al 2 O 3 :C (Luxel) Bleaching by one day exposure to sun light

24 OSL detectors Detector type Landauer Al 2 O 3 :C (Luxel) Bleaching by one day exposure to sun light Reading with self-developed argon ion laser system

25 OSL detectors mirror filter objective Ar + laser Luxel filter PMT

26 OSL intensity [au] OSL detectors 4.E+05 3.E+05 Luxel Integration interval 0 s 100 s 3.E+05 2.E+05 2.E+05 1.E+05 5.E+04 0.E Stimulation time [s]

27 Results 27

28 DOSIS and DOSIS 3D

29 Multilateral project lead by DLR since 2009 DOSIS and DOSIS 3D

30 Multilateral project lead by DLR since 2009 DOSIS and DOSIS 3D Monitoring the radiation environment in the Columbus module of the International Space Station

31 Multilateral project lead by DLR since 2009 DOSIS and DOSIS 3D Monitoring the radiation environment in the Columbus module of the International Space Station Study of the spatial and temporal variations in the radiation field

32 Multilateral project lead by DLR since 2009 DOSIS and DOSIS 3D Monitoring the radiation environment in the Columbus module of the International Space Station Study of the spatial and temporal variations in the radiation field Variety of active and passive detectors

33 Multilateral project lead by DLR since 2009 DOSIS and DOSIS 3D Monitoring the radiation environment in the Columbus module of the International Space Station Study of the spatial and temporal variations in the radiation field Variety of active and passive detectors

34 Passive detector packages [1] Thomas Berger, presentation at WRMISS 2014

35 Passive detector packages [1] Thomas Berger, presentation at WRMISS 2014

36 Dose depends on shielding Daily dose values for each experiment normalized to their average over all boxes

37 Dose depends on shielding [1] Thomas Berger, presentation at WRMISS 2014

38 Dose depends on detector type Daily dose values for each box normalized to their average over all detector types

39 Relative efficiency Dose depends on detector type 1.0 MTS-7 MCP-7 Luxel Al2O3:C single crystal LET [kev/µm]

40 Dose depends on solar cycle and ISS altitude Daily dose values for each box normalized to their average over all experiments DI DII D3DI D3DII D3DIII D3DIV D3DV D3DVI D3DVII D3DVIII

41 Dose depends on solar cycle and ISS altitude [1] [2] [3]

42 Dose depends on solar cycle and ISS altitude [1] private communication with Thomas Berger

43 Conclusions and outlook 43

44 Conclusions and outlook

45 Conclusions and outlook Luminescent detectors are very valuable for space dosimetry

46 Conclusions and outlook Luminescent detectors are very valuable for space dosimetry Trends with orbital parameters, solar cycle, shielding and detector types are consistent and make sense

47 Conclusions and outlook Luminescent detectors are very valuable for space dosimetry Trends with orbital parameters, solar cycle, shielding and detector types are consistent and make sense Continuation of DOSIS 3D and biological experiment dosimetry

48 Conclusions and outlook Luminescent detectors are very valuable for space dosimetry Trends with orbital parameters, solar cycle, shielding and detector types are consistent and make sense Continuation of DOSIS 3D and biological experiment dosimetry Investigate whether full dose measurement is possible with luminescent detectors only

49 Copyright PLEASE NOTE! This presentation contains data, information and formats for dedicated use ONLY and may not be copied, distributed or cited without the explicit permission of the. If this has been obtained, please reference it as a personal communication. By courtesy of. Studiecentrum voor Kernenergie Centre d'etude de l'energie Nucléaire Belgian Nuclear Research Centre Stichting van Openbaar Nut Fondation d'utilité Publique Foundation of Public Utility Registered Office: Avenue Herrmann-Debrouxlaan 40 BE-1160 BRUSSELS Operational Office: Boeretang 200 BE-2400 MOL