Five spices, cumin, coriander, clove, cinnamon and black pepper were irradiated by gamma-ray doses of 1.0 and 5.0 kGy and
thermoluminescence (TL) method was used for identification of the irradiation treatment. The TL response of the minerals isolated
from irradiated samples was much higher as compared to the mineral particles from unirradiated control samples. For the normalisation
of results the separated minerals were reirradiated to a normalisation dose of 1.0 kGy and the TL glow curve was recorded
a second time. By comparing the glow curves of irradiated and unirradiated samples, finding the ratio of the areas of first
and second glow curves (TL1/TL2) and comparing the shapes of the glow curves, all the irradiated and unirradiated samples were identified correctly.