SVIBOR - Project code: 1-03-118

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

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Project code: 1-03-118


NUCLEAR ANALYTICAL METHODS


Main researcher: VALKOVIĆ, VLADIVOJ (56164)


Assistants
Type of research: basic
Duration from: 01/01/91. to 12/31/95.
Papers on project (total): 65
Papers on project quoted in Current Contents: 48
Institution name: Institut "Ruđer Bošković", Zagreb (98)
Department/Institute: Department of physics, Division of experimental physics
Address: Bijenička cesta 54
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (01) 434-206
Fax: 385 (01) 434-467
E-mail: jaksic@olimp.irb.hr
Summary: On the basis of research of the ion and x-ray beam interaction with material, different nuclear analytical methods are under development. Characteristics of different nuclear and atomic processes are studied by measurements of cross sections for nuclear reactions, elastic scattering, x-ray emission etc., using proton and heavier ion beams. Using obtained results, methods are developed for measurements (microanalysis) of concentration distribution of elements and isotopes in studied specimens. Material characteristics are studied as the function of microelement concentrations. Developed mathematical methods are used for data interpretation. Using focused beam of low intensity, materials characteristics are studied using single ion techniques STIM (scanning transmission ion microscopy) and IBIC (ion beam induced charge).

Keywords: nuclear analytical methods, accelerators, nuclear reaction, x-ray fluorescence, mathematical models

Research goals: The main fields of research of ion beam interactions with material for development and applications of nuclear analytical techniques are: 1. Studies of x-ray production process by ion and x-ray beams. Determination of cross sections for production of K, L and M shell x-rays, using proton and C12 beams. Expected result is development of PIXE spectroscopy especially for the x-ray energy region below 2 keV. 2. Studies of the elastic scattering of protons and heavier ions by measuring the scattering cross sections and ion stopping power. Expected result is development of RBS (Rutherford Backscattering) and PES (Proton Elastic Scattering) spectroscopies. Potential method sensitivity and depth resolution are used for the applications in material science (e.g. thinmetal films). 3. Studies of nuclear reaction characteristics by the measurements of excitation functions important for the development of methods for isotope depth profiling and quantitative analysis using (p,š) reactions. 4. Development of systems for ion beam focusing (microprobe), computer control of microbeam positioning and scanning, multiparameter data acquisition system and software for experiment simulations and data interpretation. 5. Using single ion techniques different characteristic of semiconductor materials are studied using IBIC technique. Distribution of density in materials are studied using STIM technique. 6. Development and applications of X-ray Fluorescence (XRF) system as an analytical method. By studying of all steps in the process of x-ray excitation and detection, a method of standardless analysis using fundamental parameter approach is under development. All developed methods are applied to materials research, biomedical and environmental problems.

COOPERATION - PROJECTS


  1. Name of project: CI1-CT91-0858 Trace elements in coal
    Name of institution: National Centre for Scientific Research "Demokritos", Institute for Nuclear Physics
    City: Atena, Grčka

  2. Name of project: CRO/8/002 Nuclear methods in material research
    Name of institution: International Atomic Energy Agency (IAEA)
    City: Beč, Austrija

  3. Name of project: 7526/RB Reference materials for accelerator based nuclear analytical techniques
    Name of institution: IAEA
    City: Beč, Austrija

COOPERATION - INSTITUTIONS


  1. Name of institution: Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
    Type of institution: University/Faculty
    City: Legnaro, Italija

  2. Name of institution: University of Oxford, Physics Department, SPM Unit
    Type of institution: University/Faculty
    City: Oxford, V. Britanija

  3. Name of institution: Universita di Torino, Departimento di fisica esperimentale
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: 11000 - Torino, Italija

  4. Name of institution: Churchill Hospital, CRC Normal Tissue Radiobiology Research Group
    Type of institution: State institute
    Type of cooperation: Joint publishing of scientific papers
    City: Oxford, V. Britanija

  5. Name of institution: Universita di Verona, Istituto Chimica Biologica,
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: Verona, Italija
Other information about the project.
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Last update: 10/05/95
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