PSL, ESR 및 TL 측정에 의한 복합조미식품의 방사선 조사여부 검지
The Detection of Irradiated Composite Seasoning Foods by Analyzing Photostimulated Luminescence (PSL), Electron Spin Resonance (ESR) and Thermoluminescence (TL)
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미생물적 품질개선이 요구되는 복합조미식품 2종(beef broth 분말, pork bone extract 분말)을 대상으로 0~10 kGy의 감마선을 조사하고 광자극 발광(PSL), 전자스핀공명(ESR) 및 열발광(TL) 측정에 의한 조사여부 검지 가능성을 분석하였다. 조사선량에 따른 PSL photon count를 측정해 본 결과, 비조사 beef broth와 pork bone 분말은 각각 503.0과 429.5의 값을 보여 비조사 시료에서 측정되는 700 이하의 값이 확인되었다. 그러나 1~10 kGy 조사시료에서는 모두 5,000 이상의 photon count가 측정되어 이들 복합조미식품은 PSL 분석에 의해 방사선 조사여부를 신속하게 screening할 수 있었다. 또한 조사시료의 ESR 분석에서는 beef broth와 pork bone 분말에서 signal의 g-value가 2.0065와 2.0067로 각각 측정되었고, 조사선량에 따라 ESR signal intensity가 증가하는 경향으로 beef broth 분말 R2=0.9226, pork bone extract 분말 R2=0.9280의 상관을 보였으나 방사선 유래의 signal은 확인되지 않았다. TL 분석 결과 beef broth 분말의 경우에서만 170℃ 부근에서 방사선 조사 유래의 glow curve가 나타났으며, 재조사에 의한 TL ratio (TL1/TL2)는 비조사군 0.05 이하, 1 kGy 이상 조사군 1.0 이상으로 방사선 조사 여부의 검지가 가능하였다.
Abstract
Two kinds of composite seasoning products (beef broth powder, pork bone extract powder) were used for a detection trial of gamma irradiation treatment up to 10 kGy by analyzing photostimulated luminescence (PSL), electron spin resonance (ESR) and thermoluminescence (TL). PSL results showed that the photon counts of non-irradiated samples were lower than 700, while those of irradiated samples were higher than 5000, which makes it possible to screen irradiated composite seasoning products at 1 kGy or over from the non-irradiated control. ESR signals measured for both irradiated samples were not irradiation-specific, even though they were dose dependent in the signal intensity. Radiation-induced TL glow curves were found in irradiated beef broth powder and furthermore, TL ratio (TL1/TL2) obtained by a re-irradiation step could verify the detection result of TL1 glow curves, showing ratios lower than 0.05 in the non-irradiated sample and higher than 1.00 in irradiated ones.
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