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• W2231777267 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 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." @default.
• W2231777267 created "2016-06-24" @default.
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• W2231777267 date "1996-01-01" @default.
• W2231777267 modified "2023-09-27" @default.
• W2231777267 title "Ion Beam Analysis - Development and Application of Nuclear Reaction Analysis Methods, in particular at a Nuclear Microprobe" @default.
• W2231777267 hasPublicationYear "1996" @default.
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