EPR investigation of some traditional oriental irradiated spices |
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| Institution: | 1. University of Bucharest, Department of Atomic and Nuclear Physics, Măgurele, C.P. MG-11, RO-077125 Bucharest, Romania;2. National Institute for Physics and Nuclear Engineering -Horia Hulubei, C.P. MG-6, RO-077125 Bucharest, Romania;1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;2. Institute of High Energy Physics, Chinese Academy of Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100049, China;1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. Beijing Key Laboratory of Clothing Materials R & D and Assessment, Department of Materials Science & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China;1. Comissão Nacional de Energia Nuclear, Instituto de Engenharia Nuclear – IEN/CNEN, Rua Hélio de Almeida, 75, Ilha do Fundão, P.O. Box 68550, 21941-906 Rio de Janeiro, RJ, Brazil;2. Universidade Gama Filho, Departamento de Ciência da Computação, Rua Manoel Vitorino, 553 Piedade, Rio de Janeiro, Brazil;1. Advanced Biomedical Imaging Research Center, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan;2. Division of Functional and Diagnostic Imaging Research, Department of Radiology, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan;3. Division of Radiology, Department of Radiology, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan;4. Department of Radiology, Graduate School of Medical Science, University of the Ryukyus, Nakagami-Gun, Okinawa, Japan;1. Institute of Physics, Kazan Federal University, 420008 Kazan, Russia;2. Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris-Sud, 91405 Orsay, France |
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| Abstract: | The 9.50 GHz electron paramagnetic resonance (EPR) spectra of unirradiated and 60Co γ-ray irradiated cardamom (Elettaria cardamomum L. Maton, Zingiberaceae), ginger ((Zingiber officinale Rosc., Zingiberaceae), and saffron (Crocus sativus L., Iridaceae) have been investigated at room temperature. All unirradiated spices presented a weak resonance line with g-factors around free-electron ones. After γ-ray irradiation at an absorbed dose of up to 11.3 kGy, the presence of EPR spectra whose amplitude increase monotonously with the absorbed dose has been noticed with all spices. A 100 °C isothermal annealing of 11.3 kGy irradiated samples has shown a differential reduction of amplitude of various components that compose initial spectra, but even after 3.6 h of thermal treatment, the remaining amplitude represents no less then 30% of the initial ones. The same peculiarities have been noticed after 83 days storage at room temperature but after 340 days storage at ambient conditions only irradiated ginger displays a weak signal that differs from those of unirradiated sample. All these factors could be taken into account in establishing at which extent the EPR is suitable to evidence any irradiation treatment applied to these spices. |
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