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Ion Beam Analysis - Development and Application of Nuclear Reaction Analysis Methods, in particular at a Nuclear Microprobe

Sjöland, K Anders (1996)
Abstract (Swedish)
Popular Abstract in Swedish

Denna avhandling handlar om utveckling och tillämpning av metoder för jonstråleanalys av lätta ämnen (lättare än ungefär aluminium), framförallt vid en nukleär mikrosond. Vid en nukleär mikrosond accelereras tunga partiklar, t.ex. protoner, av en partikelaccelerator och fokuseras av ett speciellt magnetiskt linssystem ned till en storlek av ungefär 1 mikrometer. Denna stråle sveps sedan över provet, och de inducerade signalerna detekteras för att analysera förekomsten av grundämnen och strukturen hos ett prov. Vanliga tillämpningar finns inom medicin, biologi, geologi, materialvetenskap, konst, arkeologi m.fl. områden. I avhandlingen rapporteras utvecklingen av ett analyssystem för samtidig... (More)
Popular Abstract in Swedish

Denna avhandling handlar om utveckling och tillämpning av metoder för jonstråleanalys av lätta ämnen (lättare än ungefär aluminium), framförallt vid en nukleär mikrosond. Vid en nukleär mikrosond accelereras tunga partiklar, t.ex. protoner, av en partikelaccelerator och fokuseras av ett speciellt magnetiskt linssystem ned till en storlek av ungefär 1 mikrometer. Denna stråle sveps sedan över provet, och de inducerade signalerna detekteras för att analysera förekomsten av grundämnen och strukturen hos ett prov. Vanliga tillämpningar finns inom medicin, biologi, geologi, materialvetenskap, konst, arkeologi m.fl. områden. I avhandlingen rapporteras utvecklingen av ett analyssystem för samtidig detektion av väte, litium, bor och fluor med kärnreaktionsmetoder, som tillsammans med PIXE-metoden, pNRA och andra metoder kan användas för spårämnesanalys av praktiskt taget samtliga grundämnen i olika typer av prover. STIM-tekniken kan också samtidigt utnyttjas också och ger strukturen och tjockleken av det undersökta materialet. Tillämpningar har bl.a. skett inom medicin (BNCT (Boron Neutron Capture Therapy - en cancerterapi), litiummediciner (mot mano-depressivitet) och odontologi (tandvårdsmaterial). Koncentrationer på ppm-nivå kan analyseras med en lateral upplösning på ungefär 1 mikrometer. I vissa fall kan också djupprofiler samtidigt erhållas, d.v.s. att tredimensionella bilder kan erhållas. (Less)
Abstract
This thesis treats the development of Ion Beam Analysis (IBA) methods, principally for the analysis of light elements at a nuclear microprobe (NMP). The light elements are in this context defined as those with an atomic number Z of less than approximately 13 (aluminium). The work reported is to a large extent based upon multiparameter methods. Several signals are acquired simultaneously, and the data can be effectively analyzed to reveal structures that cannot be observed through one-parameter collection.



Hydrogen analysis is performed through the H(p,p)H reaction, where the two protons are measured in coincidence at 45o. A specially designed annular silicon surface barrier detector (SBD) that is devided into two halves... (More)
This thesis treats the development of Ion Beam Analysis (IBA) methods, principally for the analysis of light elements at a nuclear microprobe (NMP). The light elements are in this context defined as those with an atomic number Z of less than approximately 13 (aluminium). The work reported is to a large extent based upon multiparameter methods. Several signals are acquired simultaneously, and the data can be effectively analyzed to reveal structures that cannot be observed through one-parameter collection.



Hydrogen analysis is performed through the H(p,p)H reaction, where the two protons are measured in coincidence at 45o. A specially designed annular silicon surface barrier detector (SBD) that is devided into two halves is used for the proton detection. This is a forward scattering technique, which requires thin samples.



Lithium is measured through the 7Li(p,a)a reaction, where the two a particles are ejected almost back-to-back. This is utilised so that the two a particles are detected in coincidence by two annular SBDs, one in the forward direction and one in the backward direction. Two different set-ups for macro- and microanalysis is reported. The technique is applied to the analysis of Li drugs.



The reaction used for boron analysis is the broad resonance at 662 keV of 11B(p,a)8Be*, 8Be* -> a + a; any of the a particles can be used for analysis. The technique is applied to Boron Neutron Capture Therapy (BNCT).



The 19F(p,a)16O*, 16O* (0+) -> 16O (0+) + e- + e+ (internal pair production) is used for fluorine analysis. Any of the electron or positron is detected in coincidence with the a particle in order to suppress the background of the a particle. The technique is applied to problems related to odontology.



To perform STIM (Scanning Transmission Ion Microscopy) at high beam currents, off-axis STIM is used so that STIM and the techniques for elemental analysis can be performed simultaneously.



The above mentioned techniques are, by the work reported in this thesis, combined in a new set-up at the Lund Nuclear Microprobe. The various detectors for reaction products are arranged in such a way that they can be used for the simultaneous analysis of hydrogen, lithium, boron and fluorine together with traditional PIXE (Particle Induced X-ray Emission) analysis and STIM as well as pNRA (photon-tagged Nuclear Reaction Analysis).



Finally, a technique to reject pile-up pulses and defective tail pulses from surface barrier detectors by the use of pulse shape discrimination (PSD) is demonstrated. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • Dr Vickridge, Ian C., Lower Hutt, New Zealand
publishing date
type
Thesis
publication status
published
subject
keywords
ION BEAM ANALYSIS, HYDROGEN ANALYSIS, LITHIUM ANALYSIS, BORON ANALYSIS, FLUORINE ANALYSIS, BNCT, PSD, AFFECTIVE DISORDER, STIM, NRA, PIXE, SURFACE BARRIER DETECTORS, pNRA, Kärnfysik, Nuclear physics, DEPTH PROFILING, NUCLEAR MICROPROBE, PILE-UP REJECTION, Fysicumarkivet A:1996:Sjöland
pages
106 pages
publisher
Nuclear Physics (Faculty of Science)
defense location
Hall B, Dept. of Physics, Lund
defense date
1996-11-29 10:15
external identifiers
  • other:ISRN: LUNFD6/(NFFR-1016) (1996)
ISBN
91 628 2274 8
language
English
LU publication?
no
id
c36c9d7c-00cc-487a-8f1e-f28e2ad2a397 (old id 28813)
date added to LUP
2007-06-12 11:44:30
date last changed
2016-09-19 08:45:06
@phdthesis{c36c9d7c-00cc-487a-8f1e-f28e2ad2a397,
  abstract     = {This thesis treats the development of Ion Beam Analysis (IBA) methods, principally for the analysis of light elements at a nuclear microprobe (NMP). The light elements are in this context defined as those with an atomic number Z of less than approximately 13 (aluminium). The work reported is to a large extent based upon multiparameter methods. Several signals are acquired simultaneously, and the data can be effectively analyzed to reveal structures that cannot be observed through one-parameter collection.<br/><br>
<br/><br>
Hydrogen analysis is performed through the H(p,p)H reaction, where the two protons are measured in coincidence at 45o. A specially designed annular silicon surface barrier detector (SBD) that is devided into two halves is used for the proton detection. This is a forward scattering technique, which requires thin samples.<br/><br>
<br/><br>
Lithium is measured through the 7Li(p,a)a reaction, where the two a particles are ejected almost back-to-back. This is utilised so that the two a particles are detected in coincidence by two annular SBDs, one in the forward direction and one in the backward direction. Two different set-ups for macro- and microanalysis is reported. The technique is applied to the analysis of Li drugs.<br/><br>
<br/><br>
The reaction used for boron analysis is the broad resonance at 662 keV of 11B(p,a)8Be*, 8Be* -&gt; a + a; any of the a particles can be used for analysis. The technique is applied to Boron Neutron Capture Therapy (BNCT).<br/><br>
<br/><br>
The 19F(p,a)16O*, 16O* (0+) -&gt; 16O (0+) + e- + e+ (internal pair production) is used for fluorine analysis. Any of the electron or positron is detected in coincidence with the a particle in order to suppress the background of the a particle. The technique is applied to problems related to odontology.<br/><br>
<br/><br>
To perform STIM (Scanning Transmission Ion Microscopy) at high beam currents, off-axis STIM is used so that STIM and the techniques for elemental analysis can be performed simultaneously.<br/><br>
<br/><br>
The above mentioned techniques are, by the work reported in this thesis, combined in a new set-up at the Lund Nuclear Microprobe. The various detectors for reaction products are arranged in such a way that they can be used for the simultaneous analysis of hydrogen, lithium, boron and fluorine together with traditional PIXE (Particle Induced X-ray Emission) analysis and STIM as well as pNRA (photon-tagged Nuclear Reaction Analysis).<br/><br>
<br/><br>
Finally, a technique to reject pile-up pulses and defective tail pulses from surface barrier detectors by the use of pulse shape discrimination (PSD) is demonstrated.},
  author       = {Sjöland, K Anders},
  isbn         = {91 628 2274 8},
  keyword      = {ION BEAM ANALYSIS,HYDROGEN ANALYSIS,LITHIUM ANALYSIS,BORON ANALYSIS,FLUORINE ANALYSIS,BNCT,PSD,AFFECTIVE DISORDER,STIM,NRA,PIXE,SURFACE BARRIER DETECTORS,pNRA,Kärnfysik,Nuclear physics,DEPTH PROFILING,NUCLEAR MICROPROBE,PILE-UP REJECTION,Fysicumarkivet A:1996:Sjöland},
  language     = {eng},
  pages        = {106},
  publisher    = {Nuclear Physics (Faculty of Science)},
  title        = {Ion Beam Analysis - Development and Application of Nuclear Reaction Analysis Methods, in particular at a Nuclear Microprobe},
  year         = {1996},
}