Properties of Pulsed Photostimulated Luminescence and Thermoluminescence for Detection of Gamma-Irradiated Teas during Storage
2004
Kausar, Tusneem (Kyungpook National University, Daegu, Republic of Korea) | Yang, J.S. (Korea Atomic Energy Research Institute, Daejeon, Republic of Korea) | Kim, B.K. (Kyungpook National University, Daegu, Republic of Korea) | Kwon, J.H. (Kyungpook National University, Daegu, Republic of Korea), E-mail: jhkwon@knu.ac.kr | Byun, M.W. (Korea Atomic Energy Research Institute, Daejeon, Republic of Korea)
Green, black and oolong teas were irradiated by ∨60Co-gamma rays (0~10 kGy) and were investigated for detection of irradiation treatment using pulsed photostimulated luminescence (PPSL) and thermoluminescence (TL) during storage. Teas irradiated at 2.5 kGy or more showed a photon count of greater than 5000 counts/60 sec while the non-irradiated yielded only 650~1000 count/60 sec. Correlation coefficients between irradiation dose and photon counts/60 sec were 0.8951, 0.7934 and 0.9007 for green, black and oolong teas, respectively.
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