Κατεύθυνση Ιατρική Φυσική-Ακτινοφυσική
Library of the School of Health Sciences

2021-11-22

2021

Theologitis Stylianos

Ελένη Καλδούδη, Καθηγήτρια, Τμήμα Ιατρικής, ΔΠΘ
Αθανάσιος Ζησιμόπουλος, Τμήμα Ιατρικής, ΔΠΘ
Πιπίτσα Βαλσαμάκη, Τμήμα Ιατρικής, ΔΠΘ

Ανίχνευση σήματος ακτινοβολημένων τροφίμων στην ελληνική αγορά χρησιμοποιώντας τεχνικές φωταύγειας

Greek

Detection of irradiated food in the Greek market using luminescence techniques

Luminescence techniques are the most thoroughly studied of all the methods used to detect radiation exposure. The present work deals with the application of the phenomenon of thermoluminescence (TL) for the detection of irradiated food.
Food irradiation is the technology that improves the safety and extends the shelf life of food, by reducing or eliminating harmful microorganisms and insects. In order to ensure food safety, proper radiation control and detection of irradiated food is necessary to facilitate international trade in irradiated food and to increase consumer confidence.
The detection process is based on the TL properties that appearing from the silicate content of the irradiated sample. After separation of the organic material, it is possible to extract certain polymeric substances (such as quartz and feldspars) that are suitable for ΤL analysis due to the interaction of foods with ionizing radiation.
The TL method was successfully applied to distinguish between irradiated and non-irradiated oregano, while the same procedure did not work for potato samples.
The samples of irradiated oregano, show a high percentage of sensitization, which with the application of a specific correction protocol, reaches zero percentages.
The study for the dose response for irradiated oregano gave a linear relationship between the normalized TL signal and the dose, until 30 Gy. However, this linearity is interrupted as the dose increases after 50 Gy, where sub-linearity occurs.
With the TL method, a protocol for dose recovery was applied for an irradiated oregano sample, for two different dose ranges.
Finally, the study of TL signal fading over a period of 30 days showed the signal loss rate for 4 different temperature ranges.
The measurements were performed at the Athena Research Center in Xanthi with a Risø TL / OSL.

Health Sciences

Thermoluminescence, Oregano, Potato, Silicate minerals , Dose response, Fading, Dose recovery

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https://pergamos.lib.uoa.gr/uoa/dl/object/2966006