Inter-laboratory Study to Define the Temperature Interval for a Thermoluminescence Heating Unit Used to Identify Irradiated Food

다국어 초록 (Multilingual Abstract)

EN 1788:2001 suggests defining the temperature range for the thermoluminescence (TL) heating unit to calculate the TL ratio (TL1/TL2). In the present study,practical temperature ranges were established by using well-characterized lithium fluoride (LiF, TLD-100®) at 4different research institutes in Korea. Temperature ranges differed according to models of TLD heating unit, which were wide in the case of RISØ (160-249°C) as compared with Harshaw (155-232oC) TLD readers. The silicate minerals separated from irradiated turmeric samples were measured to check these intervals on a practical basis. The X-ray diffraction (XRD) analysis of separated minerals showed that quartz and feldspar minerals were the main source of well-characterized TL glow curve following irradiation. The TL glow peaks from the separated minerals were narrower in Harshaw than RISØ TLD readers. The TL ratios determined after re-irradiation (1 kGy) for the tested minerals, using the pre-defined temperature intervals, provided the satisfactory results.

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