ERDIT EUROPEAN RADIATION DETECTION AND IMAGING TECHNOLOGY PLATFORM. Prof. Christer Fröjdh, Mid Sweden University
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1 ERDIT EUROPEAN RADIATION DETECTION AND IMAGING TECHNOLOGY PLATFORM Prof. Christer Fröjdh, Mid Sweden University
2 OBJECTIVES Advanced radiation detectors require technology development in several areas Microelectronics Sensor materials Hybridization Production volumes are generally too small to motivate these developments Joining forces between different applications will help to generate a critical mass Applications show similarities but also differences
3 EUROPEAN RADIATION DETECTION AND IMAGING PLATFORM (ERDIT) The mission of the European Radiation Detection and Imaging Technology Platform is to promote the research on radiation detectors and imaging at European level. The aim of this platform is to synergistically implement a common research strategy across research infrastructures involving research laboratories, academy and industry which would benefit fundamental science, promote innovation in industry and would feed into the crucial European societal challenges. This would be implemented through a process of guidance, prioritization and promotion of research, innovation and education with respects to fundamental science principles and contemporary benefit to society and growth of global competitiveness of European industries.
4 EUROPEAN RADIATION DETECTION AND IMAGING PLATFORM (ERDIT) Collect information on important challenges for the development of high performance radiation detectors Collect information on the shortcomings of the current detectors as seen by the applications Work on common strategies for research and development in Europe. Develop technology roadmaps for radiation detector development Raise the awareness of the needs for radiation detectors and their impact on societal challenges Promote the field of research, education, innovation and knowledge transfer at national and European level
5 WHAT SHOULD THE PLATFORM COVER? Technologies Sensor materials Readout electronics Hybridization Packaging Data communication Data processing Future and emerging technologies Applications Astronomy Beam Monitoring Electron Cryo-microscopy Fusion Facilities Hadron Therapy High Energy Physics Medical Imaging Neutron Sources Nuclear Physics Environmental Monitoring Synchrotron Applications
6
7 ERDIT ACTIVITIES The website erdit.eu Network meetings ERDIT in Pisa April 2015, 13th-14th of April ERDIT in Stockholm 6 th - 7 th October 2014 ERDIT in Freiburg 7 th - 8 th April 2013 ERDIT at IAEA - Vienna 30 th Sept. - 1 st Oct Kickoff meeting at CERN 11 th April 2013 Next meeting ERDIT in Athens April 2016
8 ERDIT ACTIVITIES National networks Sweden, Greece, Germany, Italy, UK, Norway, France, Hungary COST proposal Proposal submitted on March 24, 2015 WP1/WG1 Application requirements and standardisation WP2/WG2 Technology Roadmap Simulation of radiation detection systems Readout electronics Sensor materials and processing Hybridisation and mounting Packaging and system integration WP3/WG3 Future and emerging technologies WP4/WG4 Dissemination and training Evaluation results expected on October 30.
9 BASIC DETECTION PRINCIPLES
10 GAS FILLED DETECTORS A particle that passes through the gas will create ions along the track Ionisation chamber No gain, signal proportional to deposited energy Proportional counter Gain via gas multiplication, signal proportional to deposited energy Geiger counter Complete ionisation of the gas, no information on deposited energy
11 PIXEL DETECTORS WITH GEM Gas gain grids as GEM and TPC are used with pixel detector readout electronics for X-ray imaging Around charges/mev TwinGrid: A wafer post-processed multistage Micro Patterned Gaseous Detector, Y. Bilevych, V.M. Blanco Carballo, M. Chefdeville, M. Fransen, H. van der Graaf, C. Salm, J. Schmitz, J. Timmermans, NIM-A, V 610, N 3, 2009
12 SOLID STATE DETECTORS Semiconductors Radiation interactions release electron hole pairs that generate a pulse or a current Scintillators Radiation interactions generate light that can be collected by a photodiode or a photomultiplier
13 CHARGED PARTICLES Protons Alpha particles Ions Fission fragments Electrons Generate charge tracks in sensor materials: The Bragg peak Characterised by: Mass Charge Energy
14 DETECTORS FOR CHARGED PARTICLES The particle leaves a charge track as it passes through the detector If the particle is completely stopped then the energy can be measured
15 THE BRAGG PEAK Energy deposition in a pixel detector
16 THE INTEGRATED DE/E DETECTOR The de/e detector can measure both mass and energy of a charged particle. Our process is based on wafer bonding with a buried metal
17 ELECTRONS Simulation of 300 kev electrons in Silicon The tracks cover several hundred microns Substantial backscattering
18 APPLICATION: RADON MEASUREMENTS
19 THE RADON DECAY CHAIN
20 THE MEASUREMENT SETUP
21 Bq RADON LEVEL AS A FUNCTION OF TIME A103 A115 A Time (h)
22 NEUTRONS
23 NEUTRONS Stopped by certain materials. Secondary particles detected 3 He + n -> 3 H + 1 H MeV 6 Li + n -> 4 He + 3 H MeV 10 B + n -> 7 Li + 4 H MeV + g(0.48 MeV) -> 7 Li + 4 H MeV
24 NEUTRON DETECTORS A converter layer stops the neutrons and releases charged particles These particles are then detected by a semiconductor detector The converter must be thin enough to allow the secondary particles to pass into the detector
25 STRUCTURED NEUTRON DETECTOR
26 PHOTONS
27 PHOTON INTERACTIONS Photons interact by: Photoelectric absorption Compton Scattering Pair production > 1 MeV Stopping in a material is proportional to the electron density Heavy atoms needed The photon is either stopped or passes through the detector unnoticed
28 SEMICONDUCTOR OR SCINTILLATOR In a scintillator the light is emitted in all directions Losses at walls Limited spatial resolution Scintillators can be made in large volumes In a semiconductor the electric field directs the charge to the nearest contact Requires very pure materials to get full depletion Scintillator Semiconductor Contact
29 PHOTON INTERACTIONS Photoelectric Compton Electron Fluorescence photon Compton Electron Scattered photon Photoelectric absorption and Compton scattering gives the same signal unless any of the reaction products escape the detector
30 SENSOR MATERIALS Name Atomic Bandgap number (ev) Density Abs. 100 KeV in 0.5 mm Fluroescence length (um) Si % 12 Ge % 50 GaAs 31, % 40 CdTe 48, % 112 TlBr 81, % 621
31 Absorption STOPPING IN 0.5 MM LAYERS 1 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 0, KeV Si GaAs CdTe
32 SCINTILLATOR BASED DETECTORS A scintillator converts deposited energy to light. Important properties Stopping power Light yield Emission wavelength Refractive index The light from the scintillator is typically recorded using a photodiode or a photomultiplier Material Density (g/cm 3 ) Refract. index Peak emission (nm) Photons per MeV CsI (Tl) GADOX (Eu) 7.5? (Gd 2 O 2 S) YAG (Ce) (Y 3 Al 5 O 12 ) CWO (CdWO 4 ) BGO (Bi(GeO 4 ) 3 ) ZWO (ZnWO 4 ) LSO (LuSiO 5 ) LuAG (Ce) 6.71? 510 (Lu 3 Al 5 O 12 ) * estimated value Si = charges/mev
33 STRUCTURED SCINTILLATORS Structured scintillators can improve the spatial resolution Columnar CsI The scintillating guides screen Recent advances in columnar CsI(Tl) scintillator screens Stuart R. Miller ; Valeriy Gaysinskiy ; Irina Shestakova ; Vivek V. Nagarkar Proc. SPIE 5923, (September 16, 2005)
34 APPLICATIONS FOR RADIATION DETECTORS
35 SOME APPLICATIONS High energy physics Fast timing Tracking Radiation hardness Material budget Synchrotron applications High fluxes Fast readout Area Spectral resolution Spatial resolution Medical imaging Quantum efficiency Large area Industrial applications High energies Security High selectivity Environmental conditions Neutron imaging Special sensor materials High selectivity
36 SYNCHROTRONS
37
38 TIMING
39 DYNAMIC RANGE Example from X-ray diffraction where weak spots could be located close to extremely bright spots
40 MEDICAL IMAGING
41 MEDICAL IMAGING Quantum efficiency!!! Spectroscopy is probably the next trend CT High flux many Mcps/mm 2 High speed rotation times less than 1 s Stability Imaging Large area up to 43 x 43 cm 2
42 Absorption X-RAY ATTENUATION IN A 500 UM THICK LAYER OF SOME SEMICONDUCTORS 1 0,8 0,6 0,4 0,2 Si GaAs CdTe KeV
43 FROM DENTAL TO FULL CHEST IMAGING
44 SPECTRAL IMAGING Different contrast agents in one image Separate bone and contrast agent. N. G. Anderson et.al.spectroscopic (multi-energy) CT distinguishes iodine and barium contrast material in MICE, Computed Tomography, 2009
45 SPECTROSCOPIC COLOUR IMAGING Iodine: Pulmonary circulation Barium: Lung Bone: normal structure Courtesy: A. Butler
46 SECURITY
47 THE PROBLEM To monitor radiation levels in an area and to send an alarm in case of suspected security risks The system should be energy sensitive and selective between gammas, neutrons and charged particles The system should be sensitive to levels slightly above the natural background The system should be able to distinguish between Variations in natural background Variations due to legal sources Variations due illegal sources, accidents or nuclear attacks
48 MOBILE RADIATION SURVEILLANCE GPS Gamma Sensor data Group Management Presence Operator X Operator Y INTERNET SBG 3G IMS Application Server GPS H 2 O Acc Google Earth CO Sensors in Google Earth / Maps Sensor distribution (flow) IMS communication (IMS)
49 NOISELESS DETECTOR WITH PARTICLE RECOGNITION Measurements of natural background radiation with a Medipix2-USB device equipped with a 700 mm thick silicon sensor (10 min exposure time). Various traces and tracks of X-ray photons, electrons and some a-particles are displayed. A rare cosmic muon track is clearly seen traversing the sensor horizontally. Study of the charge sharing in a silicon pixel detector by means of a-particles interacting with a Medipix2 device M. Campbell, E. Heijne, T. Holy, J. Idarraga, J. Jakubek, C. Lebel, C. Leroy, X. Llopart, S. Pospısil, L. Tlustos, Z. Vykydal, NIM-A 591, 2008
50 CURRENT NETWORK WITH 15 DETECTORS RUNNING LOW ACTIVITY MONITORING (ATLAS)
51 NEUTRON IMAGING
52 NEUTRON IMAGING Current technology Mainly large area 3 He detectors Choppers to select neutron energy Future trends (?) Higher spatial resolution smaller detectors, closer to the object Semiconductor detectors Timing to select energy
53 LIF STUFFED SILICON PIXEL DETECTOR
54 CONVERTER FILLED PORE MATRIX n + 6 Li 4 He + 3 H MeV n + 10 B 7 Li* + 4 He 7 Li + 4 He MeV g +2.3 MeV (93%) 7 Li + 4 He +2.8 MeV ( 7%)
55 TECHNOLOGIES
56 THE HYBRID PIXEL DETECTOR Separates the different functions of the detection process Sensor layer Analog processing Digital processing Information storage and communication
57 WHAT IS COMMON? Sensor material Silicon for particles High-Z materials for gamma Converters for neutrons Analog input Pulse counting or integrating Digital data processing Digitizing pulses or stored charge Readout electronics Hybridization One or more levels Mounting and packaging Tiling Environmental protection Power and signals
58 WHAT IS COMMON? Sensor material Silicon for particles High-Z materials for gamma Converters for neutrons Analog input Pulse counting or integrating Digital data processing Digitizing pulses or stored charge Readout electronics Hybridization One or more levels Mounting and packaging Tiling Environmental protection Power and signals
59 DOPING GRADIENTS IN A SILICON WAFER Image taken with a MEDIPIX2 system at low bias. The effect is less significant at overdepletion
60 CADMIUM TELLURIDE
61 3D SENSORS p+ n- n+ n- p+ n- n+ n- p+ n- n+ n- p
62 PROBLEMS Uniformity especially in high-z materials Radiation hardness New processing techniques - compatibility Edgeless detectors for tiling 3D-detectors
63 WHAT IS COMMON? Sensor material Silicon for particles High-Z materials for gamma Converters for neutrons Analog input Pulse counting or integrating Digital data processing Digitizing pulses or stored charge Readout electronics Hybridization One or more levels Mounting and packaging Tiling Environmental protection Power and signals
64 TRENDS Separated analog and digital chips Separate optimization Different combinations Requires reliable high-density hybridization Advanced digital processing Auto-ranging (switch from counting to integrating) ADC in pixel Data storage Data compression and advanced readout schemes
65 WHAT IS COMMON? Sensor material Silicon for particles High-Z materials for gamma Converters for neutrons Analog input Pulse counting or integrating Digital data processing Digitizing pulses or stored charge Readout electronics Hybridization One or more levels Mounting and packaging Tiling Environmental protection Power and signals
66 D STACKING
67 PROBLEMS The cost of bump bonding Reliability Yield especially in multi level hybridization
68 WHAT IS COMMON? Sensor material Silicon for particles High-Z materials for gamma Converters for neutrons Analog input Pulse counting or integrating Digital data processing Digitizing pulses or stored charge Readout electronics Hybridization One or more levels Mounting and packaging Tiling Environmental protection Power and signals
69 A MODULAR DETECTOR WITH SEAMLESS TILING
70 PROBLEMS Access with power and signal lines Heat dissipation Seamless tiling
71 CONCLUSION There is a need for a joint effort on radiation detector development in Europe. Critical mass for development as well as for production Common technology roadmaps Better access to research funding COST will support a network if granted ATTRACT will fund research projects
72 THANK YOU!
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