| Summary: | Archaeological evidence indicates that a group of humans arrived in the southern region of Thailand around 40,000
years ago. This hypothesis is based on the discovery of human and animal bones, beads, and ceramics, as well as fossilized
freshwater shells. This current study used thermoluminescence (TL) to date freshwater fossil shells from the archeological sites at
Cliff Deva Thoud-Ta Thoud-Yai in Songkhla province of Thailand. Organic compounds having unpaired electrons trapped by
crystal defects are required for TL dating. The method needs two factors for precise dating: the annual dose and the accumulated
doses. We estimate the annual dose using the Dose Rate and Age Calculator (DRAC). Regarding the accumulated dose, we used
glow-curve deconvolution (GCD) for general orders of the kinetics. The accumulated dose is determined by the relationship
between the TL radiation intensity and the accumulated gamma radiation. Using linear regression, the dependency of TL
intensity on dose was modeled. All fossil shells were dated at a temperature of 350°C for TL, and their ages were estimated to be
9485.96 ± 564.13 year. This outcome will ultimately help us understand more about how people in that region lived.
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