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Physical Detection Properties of Irradiated Wheat and Corn Treated with Different Radiation Sources  

Kim, Gui-Ran (Department of Food Science and Technology, Kyungpook National University)
Lee, Ju-Woon (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Kim, Jeong-Sook (Department of food Nutrition & Culinary, Keimyung Collage)
Kwon, Joong-Ho (Department of Food Science and Technology, Kyungpook National University)
Publication Information
Food Science and Preservation / v.16, no.2, 2009 , pp. 211-216 More about this Journal
Abstract
This study determined the photostimulated luminescence(PSL), thermoluminescence(TL), and electron spin resonance(ESR) properties of wheat and corn irradiated with 0-10 kGy of gamma-ray or electron-beam. PSL values of both irradiated grains, regardless of radiation source, were 241-429 photons/sec in nonirradiated samples(negative values, defined as ${\leq}700$ photons/60 sec) and 5,528-40,870 photons/60 sec in irradiated ones(positive values, defined as ${\geq}5,000$ photons/sec), thereby distinguishing irradiated from nonirradiated samples. The TL glow curves($TL_1$) peaked at around $300^{\circ}C$ in nonirradiated samples, but at about $180^{\circ}C$ in irradiated samples, at high intensities, regardless of radiation source. The TL ratios($TL_1/TL_2$) calculated to strengthen $TL_1$ data reliability were less than 0.03 for nonirradiated samples and over 0.20 for irradiated materials, in good agreement with threshold values for nonirradiated(${\leq}0.1$) and irradiated(${\geq}0.1$) samples. ESR analysis was not applicable in identification of irradiated wheat and corn. Electron-beam irradiation resulted in higher PSL and TL signals than did gamma-rays, at the same applied doses.
Keywords
wheat; corn; radiation sources; identification; PSL; TL;
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