방사선조사 건조향신채소의 PSL, TL 및 ESR 검지 특성
Identification Characteristics of Irradiated Dried-Spicy Vegetables by Analyzing Photostimulated Luminescence (PSL), Thermoluminescence (TL) and Electron Spin Resonance (ESR)
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참고문헌
초록
건조 채소류 중 건조 양파 및 마늘에 대하여 감마선 조사(1,4,7 kGy)에 따른 검지특성을 photostimulated luminescence (PSL), thermoluminescence (TL) 및 electron spin resonance (ESR) 분석에 의해 확인하였다. PSL 분석 결과, 건조 양파 시료는 설정된 negative(≤700) 및 positive(≥5000) 기준에 맞게 비조사군과 조사군의 차이를 쉽게 확인할 수 있었다. 그러나 건조 마늘의 경우 1 및 4 kGy 조사군은 700～5000 범위의 photon counts (intermediate)를 보였으나 7 kGy 조사군에서는 positive한 결과를 나타내었다. 반면, TL 분석 결과에서는 1 kGy 이상으로 조사된 두 시료 모두 150℃ 전후에서 TL glow curve (TL1)를 나타내어 조사 여부의 확인이 가능하였다. 또한 TL ratio (TL1/TL2)의 측정은 TL 검지결과의 신뢰성을 높여주었다. ESR 분석에서는 두 시료 모두 비 특이적인 signal이 관찰되어 적용이 불가능한 것으로 나타났다.
Abstract
The identification characteristics of irradiated dried onion and garlic at 1, 4 and 7 kGy were investigated by analyzing their photostimulated luminescence (PSL), thermoluminescence (TL) and electron spin resonance (ESR). The PSL results showed that the photon counts of non-irradiated dried onion were less than 700 (negative) and those of irradiated samples at 1 kGy or more were over 5000 (positive), making it possible to discriminate non-irradiated onions from irradicated ones. However, the intermediate counts (700-5000) were observed in irradiated garlic at 1 and 4 kGy, even though positive counts were measured in 7 kGy group. Radiation-induced TL glow curves (TL1) were measured at 150℃ range in both irradiated onion and garlic samples at 1 kGy or more, which could identify irradiated groups. Furthermore, determination of TL ratios (TL1/TL2) for both samples could verify the above results. It was found, however, that ESR spectroscopy was not suitable for the detection of irradiated dried onion and garlic.
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