nupecc prague 2011 v.havránek laboratory of iba at npi laboratory of ion beam analysis at npi...
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Laboratory of Ion Beam Analysis at NPI
Vladimír Havránek
Nuclear Physics Institute ASCR v.v.i, 250 68 Řež u Prahy, Czech Republic
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Presentation outline
Facilities - 3.5 MV Van de Graaff accelerator (since 1964) - 3 MV HVEE Tandetron accelerator (since 2005) - Activities at LWR-15 research reactor
Analytical Techniques - RBS, PIXE, ERDA, PIGE, PESA, NDP, PGAA - High energy ion implantation - Ion microanalysis
Applications - Material research, biology, environment, history and art, modification of materials with energetic ions, etc.
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Our electrostatic accelerators
VdG 1964 Tandetron 2005
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Tandetron MC 4130 AcceleratorAccelerator
PIXE, PIGE
Ion microprobe
Ion implantation
RBS, RBS-C, ERDA-TOF
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Interaction of MeV ions with the sample and corresponding analytical techniques
Základní procesy
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Van de Graaff and Tandetron 4130 MC accelerators(H-Au ions with energies 0.4-20 MeV and intensities up to several microamps)
Methods and main research fieldsRBS, RBS-channeling, ERDA, ERDA-TOFAnalyses of composition and structure of layered, nano-structured materials, hard coatings, metal- polymer composites, optoelectronics and microelectronics materials, oxidation and corrosion processes, diffusion and migration of atoms in solids, processes of self organization (e.g. metal-carbon allotropes composites) Ion microsonde3D mapping of composition and structure of materials with lateral resolution of 1 micrometer, study of biological objects ( recently Tycho de Brahe’s hairs), ancient ceramics, minerals. In 2010 first experimentswith ion writingPIXE, PIGEEnvironmental studies, mostly analyses of aerosols and micro-particles accumulated on filters Ion implantationModification of solids (e.g. improvement of properties of selected microelectronics components), simulations of radiation degradation of materials (e.g. polymers)
Devices installed on thermal neutron beam from LWR-15 research reactorMethods and main research fieldsNeutron depth profiling (NDP)Analyses of few light elements (He, Li, B, N..), study of diffusion processes in solids (e.g. inmaterials important for nuclear technologies and fusion programs), study of radiation degradationof solids (e.g. polymers), development of polymer based sensorsPrompt gamma analysis (PGA)Analyses of composition of materials (e.g. analyses of boron in biological samples for Neutron capturetumor therapy). Method complementary to Neutron activation analysis.
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Příklady aplikace metod PIXE a PIGE
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Example of TOF-ERDA spectrometer tests. Spectra of LiF (200 nm) deposited on glassy carbon. 15,4 MeV Cu6+ (Tv =2,2 MV)
Start detectorTOF-ERDA
The TOF-ERDA spectrometer set into operation in 2006 withsupport and cooperation of Rossendorf group., The system consist of thin carbon foil start detector and particle energy detector, which also provides the stop time signal. In the
near future the second stop detector will be add.
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
RBS-ChannelingThe RBS-Channelling setup is only equipment which was fully supplied by external vendor. It was bought from NEC company USA and recently installed at -30 deg. beam line. The target chamber is equipped with fine goniometer with five degrees of freedom (x,y,z,,) and two charge particle detectors. Test experiments are now in progress. There is also a possibility to add additional x or -ray detector, so the PIXE or PIGE channelling experiments can be performed in future. The setup will be used for routine RBS-channelling and RBS measurements.
Channeling software
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
1000 Cu mesh Th inclusion 25x25m
Ion microbeam (since 2009)
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Microbeam target chamber
Microscope
Far. cup
STIM
PIXE
RBS
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Two Examples of Cobalt Blue Sherds found in the Excavated Sediments from the Pool of the Royal Palace in Angkor Thom.
The sherds were first irradiated with protons frontally (Van de Graaff
Generator) and transversally (Microbeam) of medium thin (~2 mm) slices cut from the
original pieces.
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
White glaze Blue glaze Body Transition Body/Glaze
Fe 0.59 % 0.88 % 0.73 % 0.43 %
Co <0.02 % 0.60 % <0.02 % <0.02 %
Ca 9.5 % 12.0 % - 4.7 %
Elemental distribution maps 500x500 um
KK
Fe
TiCa
SiCo
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Comparison of Spatial Distributions for Co, Fe and Ca
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Cobalt inclusion – detail (maps 25x25 um for Fe, Co and As)
AsCo
GUPIX fit of a cobalt inclusion defined as a region of interest
Elemental ratios
As/Co 0.006 (0.6%)
Fe/Co 0.017 (1.7%)
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
SPATIAL WINDOW CONTAING A BRAIN
SAMPLE IRRADIATED WITH PROTON BEAM
EXAMPLES OF A SAMPLES HOLDER WITH MOUNTED CEREBELLUM BRAIN SLICES AND LIGHT MICROSCOPE
IMAGES THEREOF
SAMPLE HOLDER WITH
MOUNTED BRAIN SLICES
A LIGHT MICROSCOPE IMAGE OF THE CENTRAL PART OF THE CEREBELLUM SECTION
SCANNED WITH THE PROTON BEAM.
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Fe
S
Ca Ni
Zn
Cu
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Oxidation of zirconium
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
1.8 MeV protons )
18O a 18O b
18O b
18O a
Zr RBS
Zr PIXE
Si
Fe
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Ion beam writing (hammering) using 10-12 MeV focused beam of C, O a Si
into layer of PDMS (Polydimethylsiloxane)
In cooperation with Dr. Istvan Rajta, Atomki Debrecen, HAS
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
LVR15
HC
H-3
LVR-15 nuclear reactor REZ
neutron guide
RESEARCH REACTOR LVR-15
LVR-15 IS LIGHT-WATER MODERATED AND COOLED TANK NUCLEAR REACTOR WITH FORCE COOLING. THE FUEL IRT-2M IS ENRICHED TO 36%, COMBINED WATER-BERYLLIUM REFLECTOR IS USED.
MAIN CHARACTERISTICS:
Maximum reactor power 10 MW
Maximum thermal neutron flux in the core 1.5 x 1018 n/m2s
Maximum fast neutron flux in the core 3 x 1018 n/m2s
Thermal neutron flux at the end of the beam tube
1 x 1013 n/m2s
Thermal neutron flux in irradiation channel in fuel
1.2 x 1018 n/m2
Thermal neutron flux in irradiation channel in reflector
9 x 1017 n/m2s
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Thermal neutron guide tubeand TNDP chambers
HCH
-3
TNDPCHAMBERS
neutron guide
LVR-15 reactor hall
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
List of the NDP relevant isotopes
Basic reaction characteristics of the NDP relevant isotopes, and detection sensitivities for the NDP single-detector spectro- meter in the NPI Rez.
Detection limits are based on the charged particle counting rate 0.01 s-1, detector -sample solid angle 0.03 Sr, and intensity of the neutron beamth = 107 cm-2s-1.
3He 3.1 x 1013
6Li 1.8 x 1014
7Be* 3.5 x 1012
10B 19.6 10B(n,)7Li 4.3 x 1013
6.7 x 1014
9.1 x 1016
3.4 x1017
Nuclide Naturalabundance or activity*
[at/mCi]
Nuclear reaction Crosssection[barn]
Energy ofreactionproducts
[keV]
Detectionlimit
[at/cm2]
0.00013 3He(n,p)3H 5326 573 191
7.42 940 2051 2734
2.5 x 1014 7Be(n,p)7Li 48000 1438 207
3606 1471 839
19.6 230 1775 1014
99.64 1.81 584 42
75.5 35Cl(n,p)35S 0.49 598 17
1.4 x101659Ni* 1.3 x 1020 59Ni(n,)56Fe 12.3 4757 340
4.7 x 10124.4 x 1015 22Na(n,p)22Ne 31000 2247 103
1.2 x 10180.76 33S(n,)30Si 0.14 3091 412
10B(n,)7Li10B
6Li(n,)3H
14N 14N(n,p)14C
33S
35Cl
22Na*
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
sam
ple
x
E
, T
6Li(n, )T
energy loss E ~ depth x
220 keV 6Li Nbenergy spectrum of particles from (n, ) reactions
0 200 400 600 800 1000Channel Number
Cou
nts
per
Cha
nnel
0
500
10
00
1.0 1.5 2.0 2.5 3.0 MeV
220 keV 6Li Nb
conversion to depth
2.0 1.0 0 m
x
1.0 0.8 0.6 0.4 0.2 0
6Li(n, )T
depth surface
T
x depth
dete
ctor
conversion to energy
surf
ace
thermal neutrons 10B(n, )7Li
chan
nel-
ener
gy-d
epth
con
vers
ion
sam
ple
x
E
, T
6Li(n, )T
energy loss E ~ depth x
220 keV 6Li Nbenergy spectrum of particles from (n, ) reactions
0 200 400 600 800 1000Channel Number
Cou
nts
per
Cha
nnel
0
500
10
00
1.0 1.5 2.0 2.5 3.0 MeV
220 keV 6Li Nb
conversion to depth
2.0 1.0 0 m
x
1.0 0.8 0.6 0.4 0.2 0
6Li(n, )T
depth surface
T
x depth
dete
ctor
conversion to energy
surf
ace
thermal neutrons 10B(n, )7Li
chan
nel-
ener
gy-d
epth
con
vers
ion
Principles od NDP (Neutron Depth Profiling)
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
E
ET.x
xT
T
E
ET.x
xT
T
3D depth profile of Lidetermined from the 3D plot
Principal scheme of thedetector-target-detector
coincidence set-up
2D coincidence data plotfrom Li/B/Li/B/PET
3D coincidence data plot(detail of the 2D rectangle)
Coincidence NDP
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NuPECC Prague 2011 PGAA (Prompt Gamma Activation Analysis) facility
Instrument parameters
Installed at LVR-15 reactor
Beam 25x7 mm2
Detector HPGe (25%)
Sensitivity 3.7 counts/s /g 10B
Sample liquid/powder in 0.5 ml teflon vial
Usage: Analytical method PGAA- concentration of isotopes/elements (B, Cd, Sm, Gd, H, Cl, …)- optimized for liquid (powder) samples - biological samples (study of pharmacokinetics of boron compounds in the framework of BNCT) - minerals
Neutron flux 3x106 n cm-2s-1
Det. limits ~ 0.1 g (B,Sm,Gd) ~ 50 g (H)
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V.Havránek Laboratory of IBA at NPINuPECC Prague 2011
Dekuji za pozornost !
Thank you for your attention !