SVIBOR - Project code: 1-07-150

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

SVIBOR

SVIBOR - Collecting Data on Projects in Croatia

Project code: 1-07-150


PHYSICO-CHEMICAL EFFECTS OF IONIZING RADIATIONS


Main researcher: RANOGAJEC, FRANJO (40280)


Assistants
Type of research: basic
Duration from: 01/01/91. to 12/31/95.
Papers on project (total): 2
Institution name: Institut "Ruđer Bošković", Zagreb (98)
Department/Institute: Department of Chemistry Division of Technology, Nuclear Energy and Radiation Protection
Address: Bijenička cesta 54
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (1) 4561-175
Fax: 385 (1) 424-794
E-mail: razem olimp.irb.hr
Summary: The project deals with the characterization of physico-chemical effects of ionizing radiations in various model and real systems. The selection of systems for the investigation of physico-chemical effects of ionizing radiations is determined by the interest borne by those systems upon various aspects of the interactions of radiations and matter. The investigations of the nature and fate of the reactive short-lived species formed by the radiolysis: electrons, positive ions, excited molecules and free radicals belong to the fundamental research of the interactions between radiations and matter. This research is carried out in simple aqueous and organic solutions. Physico-chemical effects of ionizing radiations can be used for the measurement of the radiation energy absorbed in a system, which is then called a dosimetry system. According to the range of the doses measured, the subjects of the project are dosimetry systems based on inducing thermoluminescence of solids or on inducing permanent chemical changes in solutions. The development and characterization of dosimetry systems capable for measuring doses over a range of 12 orders of magnitude are also the subject of this project. Technological applications of irradiation are based on the biocidal effect of ionizing radiations upon microorganisms which happen to be contaminating pharmaceutical and medical materials and foods. While the biological effect of irradiation is dramatic, the physico-chemical effect is often hardly noticable. It is a challenge for radiation chemistry to identify and quantify these physico-chemical effects. Radiation induced effects in polymers have been studied using double-modulation electron spin resonance combined with size exclusion chromatography and positron lifetime spectroscopy combined with infrared spectroscopy and thermal analysis. Informations on free volume changes and local side-chain motions in polymer matrix due to radiation induced crosslinking or degradation were obtained. The possibility of reusing of waste rubber after radiation grafting was studied. Positive results were obtained in the case of grafting polybutadiene granulate with ethyl acrylate. The nature of observed liquid-liquid transition in unsaturated polyester resins was studied. Kinetics and mechanism of high conversion copolymerization of electron acceptor and electron donor comonomers were studied by microcalorimetric method. It was observed that in the case of copolymerization of alfa-methylstyrene with alkylmaleimides in the presence of an exces of homopolymerizable alkylmaleimide alternating copolymers are quantitatively formed prior to the formation of homopolymer. The blends of elastomeric polyurethane with different plastomers and polystyrene with natural rubber were prepared and characterized.

Keywords: Gamma radiation, radiation chemistry, radiation dosimetry, radiation processing, radiation protection, electrons, positive ions, excited molecules, free radicals, reactive species, pulse radiolysis, fast kinetics, competition kinetics, radiolytic oxydation, microbiological decontamination, sterilization, food irradiation, radiation grafting, radiation crosslinking, copolymerization, liquid-liquid transition

Research goals: The scope of investigation is the nature and fate of short-lived reactive species which are formed in the interactions of ionizing radiations and matter: electrons, positive ions, excited molecules and free radicals. A particular emphasis is on the reactions of electrons, being universal products of all ionizations, and on free radicals which are the main intermediates in the oxidative degradation of biomolecules. The knowledge of the fundamental regularities in the interaction of reactive species with the molecules of the medium makes it possible to predict chemical changes in irradiated matter, including biological consequences, as well as a systematic approach to radiation protection and radiation processing. Radiation protection, radiation processing and radiation research all depend on the well-established relationships between the absorbed dose and an effect. Therefore the scope is also the development of dosimetry methods applicable in the broad ranges of doses, dose rates and radiation qualities, and based on the physico-chemical changes in irradiated dosimetric materials -solids and solutions. The scope of the technological applications of irradiation as a biocidal agent is microbiological decontamination, pasteurization and sterilization of medical and pharmaceutical materials, as well as foods. It is necessary to demonstrate previously that irradiation does not produce any detrimental physico-chemical consequences which might jeopardize functionality and wholesomeness, the basic criterion for this being radiation-chemical changes. The scope is the development and application of methods suitable for detection and quantification of physico-chemical changes in irradiated matter. In the field of polymer research the goals are: - Radiation modification of polymers by ionising radiation, with the aim to explain the effects of irradiation in polymers and to improve the polymer properties. - Investigation of the nature of a new transition observed in unsaturated polyester resins, which could be described as liquid-liquid transition. - The investigation of kinetics and mechanism of copolymerization of electron donor and electron acceptor monomers where alternating copolymerization is preferred, to explain the role of CT-complex in the reaction. - Investigation of phase structure interaction on different structure level, miscibility and morphology of blends of elastomeric polyurethane with different elastomers or polar plastomeric components to improve properties and processability.

COOPERATION - PROJECTS


  1. Name of project: 512 YUG/8/012 Scale-up of semi-industrial gamma irradiation facility
    Name of institution: International Atomic Energy Agency
    City: Wien, Austrija

  2. Name of project: 545 CRO/8/013 Installation and commissioning of LINAC
    Name of institution: International Atomic Energy Agency
    City: Wien, Austrija

  3. Name of project: 6128/RB In-source analysis of radiation curing of unsaturated polyester resin
    Name of institution: International Atomic Energy Agency
    City: Wien, Austrija

  4. Name of project: 6121/CF Identification of irradiated foods containing lipids
    Name of institution: International Atomic Energy Agency
    City: Wien, Austrija

  5. Name of project: 7821/RB The evaluation of dosimetry methods suitable for the irradiation disinfestation of fresh and dry fruits and nuts
    Name of institution: International Atomic Energy Agency
    City: Wien, Austrija

  6. Name of project: RER/4/008 Small accelerators for science and technology
    Name of institution: International Atomic Energy Agency
    City: Wien, Austrija

  7. Name of project: Interkomparacija dozimetara čvrstog stanja za monitoring okoline
    Name of institution: Internationales Buro Julich
    City: Julich, Njemačka

  8. Name of project: High dose dosimeter intercomparison
    Name of institution: CERN
    City: Geneva, Švicarska

  9. Name of project: Osobna dozimetrija i dozimetrija okoline metodom TLD
    Name of institution: Hungarian Academy of Sciences
    City: Budimpešta, Mađarska

  10. Name of project: Industrijska primjena zračenja
    Name of institution: Hungarian Academy of Sciences
    City: Budimpešta, Mađarska

  11. Name of project: Investigation of polymer structure by positron lifetime spectroscopy
    Name of institution: Hungarian Academy of Sciences
    City: Budimpešta, Mađarska

  12. Name of project: Infrastructure for radiation protection and nuclear safetz in the Republic of Croatia. Task 4: Facilities for calibration and standardization of dosimetry in Croatia. Task 5: Education and training in the field of radiation protection.
    Name of institution: International Atomic Energy Agency
    City: Wien, Austrija

COOPERATION - INSTITUTIONS


  1. Name of institution: Institut "Ruđer Bošković", Odjel Eksperimentalna biologija i medicina
    Type of institution: State institute
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

  2. Name of institution: Institut "Ruđer Bošković", Odjel Fizička kemija
    Type of institution: State institute
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

  3. Name of institution: Institut "Ruđer Bošković", Odjel Fizika, energetika i primjena
    Type of institution: State institute
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

  4. Name of institution: Institut "Ruđer Bošković", Odjel Istraživanje i razvoj materijala
    Type of institution: State institute
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

  5. Name of institution: Klinički bolnički centar, Centar za medicinske znanosti
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  6. Name of institution: Prirodoslovno-matematički fakultet, Zavod za animalnu fiziologiju
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  7. Name of institution: Farmaceutsko-biokemijski fakultet, Zavod za biofiziku
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  8. Name of institution: Veterinarski fakultet
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  9. Name of institution: Medicinski fakultet
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  10. Name of institution: Stomatološki fakultet
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  11. Name of institution: Zavod za zaštitu zdravlja Republike Hrvatske
    Type of institution: State institute
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  12. Name of institution: "Pliva", "Pliva Institut"
    Type of institution: Economical/Production
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  13. Name of institution: "Krka", "Institut"
    Type of institution: Economical/Production
    Type of cooperation: Occasional exchange of information
    City: Novo Mesto, Slovenija

  14. Name of institution: "Lek", "Razvoj in raziskave"
    Type of institution: Economical/Production
    Type of cooperation: Occasional exchange of information
    City: 61000 - Ljubljana, Slovenija

  15. Name of institution: Institut "Boris Kidrič"
    Type of institution: State institute
    Type of cooperation: Occasional exchange of information
    City: 61000 - Ljubljana, Slovenija

  16. Name of institution: Poljoprivredni fakultet
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  17. Name of institution: Elektrotehnički fakultet
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  18. Name of institution: "Instrumentaria"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: 10000 - Zagreb, Croatia

  19. Name of institution: "Kolinska"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: 61000 - Ljubljana, Slovenija

  20. Name of institution: "Krka"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: Novo Mesto, Slovenija

  21. Name of institution: "Lek"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: 61000 - Ljubljana, Slovenija

  22. Name of institution: "Pliva"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: 10000 - Zagreb, Croatia

  23. Name of institution: "Podravka"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: 48300 - Koprivnica, Croatia

  24. Name of institution: "Razvitak"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: Ludbreg, Hrvatska

  25. Name of institution: "Saniteks"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: Velika Kladuša, B i H

  26. Name of institution: "Saponia"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: 31000 - Osijek, Croatia

  27. Name of institution: "TIK"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: Kobarid, Slovenija

  28. Name of institution: "Zlatorog"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: Maribor, Slovenija

  29. Name of institution: "Bračplastika"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: Sutivan, Hrvatska

  30. Name of institution: "Ljekarna Trešnjevka"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: 10000 - Zagreb, Croatia

  31. Name of institution: "MTČ"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: Čakovec, Hrvatska

  32. Name of institution: "Medivest"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: 10000 - Zagreb, Croatia

  33. Name of institution: "Lola Ribar"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: 47000 - Karlovac, Croatia

  34. Name of institution: "Kraš"
    Type of institution: Economical/Production
    Type of cooperation: Promotion or commercialization of results
    City: 10000 - Zagreb, Croatia

  35. Name of institution: Institut Charles Sadron
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: Strasbourg, Francuska

  36. Name of institution: Eotvos Lorand University
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: Budimpešta, Mađarska

  37. Name of institution: Tehnološki fakultet
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

  38. Name of institution: INA - razvoj i istraživanje
    Type of institution: Economical/Production
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

  39. Name of institution: "Sava" industrija gume
    Type of institution: Economical/Production
    Type of cooperation: Joint publishing of scientific papers
    City: Kranj, Slovenija

  40. Name of institution: INA-OKI - razvoj polimernih materijala
    Type of institution: Economical/Production
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

  41. Name of institution: Hahn-Meitner-Institut
    Type of institution: State institute
    Type of cooperation: Joint publishing of scientific papers
    City: Berlin, Njemačka

  42. Name of institution: Radiation Laboratory, University of Notre Dame
    Type of institution: State institute
    Type of cooperation: Joint publishing of scientific papers
    City: Notre Dame, USA

  43. Name of institution: Specijalna bolnica za bolesti dišnih puteva djece i mladeži
    Type of institution: Other
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

  44. Name of institution: Ministarstvo zdravstva Republike Hrvatske
    Type of institution: State administration
    Type of cooperation: Systematic exchange of information
    City: 10000 - Zagreb, Croatia

  45. Name of institution: Ministarstvo gospodarstva Republike Hrvatske
    Type of institution: State administration
    Type of cooperation: Joint project
    City: 10000 - Zagreb, Croatia

  46. Name of institution: Državni zavod za normizaciju i mjeriteljstvo
    Type of institution: State administration
    Type of cooperation: Other
    City: 10000 - Zagreb, Croatia

  47. Name of institution: Klinički bolnički centar Rijeka
    Type of institution: University/Faculty
    Type of cooperation: Other
    City: 51000 - Rijeka, Croatia

OTHER ACHIEVEMENTS


  1. Name: Uređaj za lasersku pulsnu fotolizu
    Type of achievement: Instrumentation
    Authors: Bonifačić M., Katušin-Ražem B., Medved-Rogina B., Mihaljević B., Ražem D., Štefanić I., Vojnović B.

  2. Name: Rekonstrukcija linearnog akceleratora elektrona
    Type of achievement: Instrumentation
    Authors: Blažević M., Ražem D., Rudolf M., Sučević Z.

  3. Name: Rekonstrukcija panoramskog uređaja za ozračivanje
    Type of achievement: Instrumentation
    Authors: Blažević M., Ranogajec F., Ražem D., Štefulj B., Vekić B.

  4. Name: Akvizicija automatskog uređaja za termoluminiscentnu dozimetriju
    Type of achievement: Instrumentation
    Authors: Vekić B., Ranogajec M.

  5. Name: Radijacijska sterilizacija farmaceutske ambalaže
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  6. Name: Radijacijska dekontaminacija suhog bilja
    Type of achievement: Technology
    Authors: Katušin-Ražem B., Ražem D.

  7. Name: Radijacijska sterilizacija medicinskih potrepština
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  8. Name: Radijacijska sterilizacija farmaceutskih pomoćnih sredstava (adjuvanata)
    Type of achievement: Technology
    Authors: Katušin-Ražem B., Ražem D.

  9. Name: Radijacijska sterilizacija antibiotika
    Type of achievement: Technology
    Authors: Katušin-Ražem B., Ražem D.

  10. Name: Radijacijska sterilizacija farmaceutskih sirovina
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  11. Name: Radijacijska sterilizacija kozmetičkih sirovina
    Type of achievement: Technology
    Authors: Katušin-Ražem B., Ražem D.

  12. Name: Radijacijska dekontaminacija kozmetičkih proizvoda
    Type of achievement: Technology
    Authors: Katušin-Ražem B., Ražem D.

  13. Name: Radijacijska sterilizacija podloga za propagaciju soje
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  14. Name: Radijacijska sterilizacija umjetnih implantata
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  15. Name: Radijacijska sterilizacija prirodnih implantata
    Type of achievement: Technology
    Authors: Zajc I., Ražem D., Katušin-Ražem B.

  16. Name: Radijacijska sterilizacija kirurških zaštitnih sredstava
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  17. Name: Radijacijska sterilizacija kirurških pribora (skalpela)
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  18. Name: Radijacijska sterilizacija transportnih fiksatora
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  19. Name: Radijacijska sterilizacija mikrobioloških podloga
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  20. Name: Radijacijska sterilizacija filtera za dijalizatore
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  21. Name: Radijacijska sterilizacija pribora za sakupljanje, čuvanje i transfuziju krvi i krvnih proizvoda
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  22. Name: Radijacijska sterilizacija medicinskog tkanoga i netkanog tekstila
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  23. Name: Radijacijska pasterizacija otopina za kontaktne leće
    Type of achievement: Technology
    Authors: Ražem D., Mihoković V.

  24. Name: Radijacijska sterilizacija ginekoloških aplikatora za terapiju i kontracepciju
    Type of achievement: Technology
    Authors: Ražem D., Katušin-Ražem B.

  25. Name: Radijacijska pasterizacija farmaceutika
    Type of achievement: Technology
    Authors: Katušin-Ražem B., Ražem D.

  26. Name: Radijacijska pasterizacija dehidriranih mesnih proizvoda
    Type of achievement: Technology
    Authors: Katušin-Ražem B., Ražem D.

  27. Name: Radijacijski izazvan učinak "pamćenja dimenzije" polimernih kabelskih zaptivača
    Type of achievement: Technology
    Authors: Ranogajec F., Ražem D.

  28. Name: Radijacijska dezinfestacija zrnja
    Type of achievement: Technology
    Authors: Katušin-Ražem B., Ražem D.

  29. Name: Radijacijska pasterizacija stabilizatora za prehrambenu industriju
    Type of achievement: Technology
    Authors: Katušin-Ražem B., Ražem D.

  30. Name: Dozimetrijska kontrola dijagnostičkih i terapijskih rendgen uređaja, zatvorenih i otvorenih izotopnih izvora zračenja u medicini, industriji i drugdje
    Type of achievement: Technology
    Authors: Vekić Branko, Miljanić Saveta

  31. Name: Osobna dozimetrija zaposlenog osoblja u medicini, istraživanju i industriji
    Type of achievement: Technology
    Authors: Vekić Branko, Ranogajec-Komor Maria
Other information about the project.
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Last update: 10/11/95
Information: svibor@znanost.hr