Abstract
The shellfish exoskeleton is mainly composed of carbonate minerals with very minute traces of silicate minerals. Feldspar (silicate mineral) has outstanding thermoluminescence (TL) characteristics, whereas carbonate minerals could lead to the false detection of irradiation history. The silicate minerals present in the biogenic exoskeleton matrix of shellfish (Corbicula and Melanian snail) were targeted for their TL properties after separating through different acid treatments of shell samples. Excellent TL results for the TL glow curve shape, intensity, and TL ratio (TL1/TL2) were obtained where the clear discrimination of irradiation treatment (0, 2, and 4 kGy) was possible. The results were compared to the whole shell powder samples, feldspar, and calcite standard minerals to present a better understanding of their luminescence characteristics. The developed TL method showed the potential to successfully identify irradiated shellfish for the regulatory requirements.
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