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Detection Characteristics of Gamma-Irradiated Korean Medicinal Herbs by Using PSL, TL, and ESR

PSL, TL 및 ESR 분석에 의한 감마선 조사 한약재의 검지 특성

  • Yang, Hee-Sun (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Park, Yong-Dae (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Jin, Chang-Hyun (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Choi, Dae-Seong (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Chung, Hyung-Wook (New Hazard Chemicals Team, Korea Food & Drug Administration) ;
  • Byun, Myung-Woo (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Jeong, Il-Yun (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
  • 양희선 (한국원자력연구원 정읍 방사선과학연구소 방사선전략기술개발부) ;
  • 박용대 (한국원자력연구원 정읍 방사선과학연구소 방사선전략기술개발부) ;
  • 진창현 (한국원자력연구원 정읍 방사선과학연구소 방사선전략기술개발부) ;
  • 최대성 (한국원자력연구원 정읍 방사선과학연구소 방사선전략기술개발부) ;
  • 정형욱 (식품의약품안전청 신종유해물질팀) ;
  • 변명우 (한국원자력연구원 정읍 방사선과학연구소 방사선전략기술개발부) ;
  • 정일윤 (한국원자력연구원 정읍 방사선과학연구소 방사선전략기술개발부)
  • Published : 2008.11.28

Abstract

The detection characteristics of gamma-irradiated ($0{\sim}10.0\;kGy$) medicinal herbs (Platycodon grandiflorum, Acanthopanax chiisanensis) were investigated by photostimulated luminescence (PSL), thermoluminescence (TL), and electron spin resonance (ESR). The results of the PSL, a first screening method in comparison with the TL, showed photon counts greater than 5,000 counts/60 s (positive) in the irradiated samples, while the non-irradiated samples yielded photon counts less than 700 counts/60 s (negative). The TL was also applied for the detection method of irradiated medicinal herbs and showed that the non-irradiated sample revealed a glow curve with a low intensity, while the irradiated samples showed a higher intensity. These results were normalized by re-irradiating the mineral grains with a irradiation dose of 1.0 kGy, and a second glow curve was recorded. The ratio of the intensity of the first glow curve ($TL_1$) to that after the normalization dose ($TL_2$) was determined and compared with the recommended threshold values. TL ratio ($TL_1/TL_2$) was below 0.007 for the non-irradiated sample and higher than 0.1 for all irradiated samples (above 1.0 kGy). ESR spectroscopy revealed specific signals (6.065 mT) derived from free radicals in cellulose containing irradiated medicinal herbs. The P. grandiflorum showed clearer signals than A. chiisanensis. From the results of our studies, the PSL, TL, and ESR determinations were found to be suitable for the detection of irradiated medicinal herbs such as P. grandiflorum and A. chiisanensis.

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