ESR response of bulk samples of clear fused quartz (CFQ) material to high doses from 10 MeV electrons: Its possible application for radiation processing and medical sterilization |
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| Institution: | 1. Physics Department, Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Iran;2. Yazd Radiation Processing Centre (YRPC), Yazd, Iran;3. Physics Department, Faculty of Science, University of Yazd, Yazd, Iran;1. Department of Bioengineering, UCLA, Los Angeles, CA, USA;2. Department of Chemical Engineering, UCLA, Los Angeles, CA, USA;3. Crump Institute for Molecular Imaging and Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA;1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China;2. Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, China;1. Faculty of Energy Engineering, Sharif University of Technology, P.O. Box 8639–11365, Tehran, Iran;2. Faculty of Physics, University of Isfahan, P.O. Box 81746–73441, Isfahan, Iran;1. Medical Applications Unit, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain;2. Ionizing Radiations Laboratory, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain;3. Astroparticle Physics Division, Basic Research Department, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain;4. Technology Department, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain;1. EC-JRC-IRMM, Institute for Reference Materials and Measurements, Retieseweg 111, 2440 Geel, Belgium;2. PTB, Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany;3. CIEMAT, Metrología de Radiaciones Ionizantes, Avda. Complutense 40, 28040 Madrid, Spain;4. CMI, Czech Metrology Institute, Radiová 1a, CZ-102 00 Praha 10, Czech Republic;5. ENEA-INMRI, Via Anguillarese, 301 Santa Maria di Galeria, 00123 Roma, Italy;6. CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), bât 602 PC111, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France;7. SMU, Slovenský metrologický ústav, Karloveská 63, 842 55 Bratislava 4, Slovak Republic;8. STUK, Radiation and Nuclear Safety Authority, P.O.Box 14, FIN-00881, Helsinki, Finland;9. IFIN-HH, 30 Reactorului Street, 077125 Magurele, Ilfov, Romania;10. BEV/PTP, Bundesamt für Eich, und Vermessungswesen, Arltgasse 35, A-1160 Wien, Austria;11. IJS, Institute Jo?ef Stefan, Jamova 39, 1000 Ljubljana, Slovenia;12. IST/CTN, Estrada Nacional 10 (km 139,7), 2695-066 Bobadela LRS, Portugal;13. NCBJ, Narodowe Centrum Badań J?drowych, RC POLATOM, ul. Andrzeja So?tana 7, 05-400 Otwock, ?wierk, Poland;14. Strojnícka Fakulta Slovenskej Technickej Univerzity v Bratislave, Nám. Slobody 17, Slovak Republic;1. Helmholtz-Zentrum Dresden – Rossendorf, Institute of Radiopharmaceutical Cancer Research, Departments of Neuroradiopharmaceuticals and Radiopharmaceutical and Chemical Biology, POB 51 01 19, D-01314 Dresden, Germany;2. DanPET AB, Rosenstigen 7, SE-216 19 Malmö, Sweden |
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| Abstract: | Clear fuse quartz (CFQ) could be a good candidate for dose measurements in the radiation processing of food material and in the sterilization of disposable medical and pharmaceutical products. In this study, bulk samples of CFQ materials were exposed to 10 MeV electrons at doses between 5–15 and 25–35 kGy; the dose ranges normally used for processing and sterilization. After irradiation, the samples were subjected to electron spin resonance analysis to test the intensity of their signal against the applied doses. The reproducibility of dose curve of the material to 10 MeV electrons was also studied, in which the dosed samples were annealed at 800 °C for 20 min and reused for further dose curve reproducibility investigation. The dose response curves of the reused samples showed a good linearity between the absorbed dose and the ESR intensity of the signals. They also indicated that the ESR intensity in the dose response curve, in both dose ranges, decreased by ～37% for the first reuse process and ～41% for the second reuse process of the samples in comparison to the first measurement. The thermal fading of the cylindrical samples of the CFQ, at room temperature, showed a sharp decay of ～20% over a period of 15 days, after which the decay-rate was negligible for a measured period of 60 days. |
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