Tehran University of Medical Sciences Frontiers in Biomedical Technologies 2345-5837 0 0 2026 06 22 828 828 Roghayeh Panahi Department of Oral and Maxillofacial Radiology, School of Dentistry, Yasuj University of Medical Sciences, Yasuj, Iran Golrokh Niknam Department of Oral and Maxillofacial Radiology, School of Dentistry, Yasuj University of Medical Sciences, Yasuj, Iran Hassan Vafapour Cellular and Molecular Research Center, Yasuj University of Medical Sciences, Yasuj, Iran 2023 09 16 2023 10 06 Purpose: The present study aimed to assess the Entrance Skin Doses (ESD) at the thyroid gland region and evaluate the local Diagnostic Reference Level (DRL) in panoramic radiography in a city (Yasuj, Iran). Materials and Methods: In the current study, 31 patients (17 women and 14 men) with a mean age of 33.90±16.49 years were included. To assess the ESD values, 3 thermoluminescence dosimeters (TLD-100) were attached to the thyroid gland region for each patient. The DRLs were estimated as the third quartile of the ESD values. The ESD variations among the different genders (men and women), devices, and age groups (children [5-10 years], adolescents [11-19 years], and adults [˃19 years]) were calculated. T-test, one-way ANOVA, and Bonferroni's post hoc test were used for parametric tests; Kruskal-Wallis and Spearman's correlation coefficient were used for the non-parametric tests. Results: Mean ESD and DRL values were obtained at 72±21 µGy and 0.091±0.02 mGy, respectively. For ESDs, there was no significant difference between different genders (men: 76±20 µGy and women: 69±23 µGy) as well as among the three investigated devices (P-value˃ 0.05). The ESD values of children were significantly lower than adolescent and adult patients (P-value<0.001); however, there was no statistically significant difference between the adolescent and adult patients (P-value =0.057). Conclusion: Compared to national/international, the DRL value in our study was relatively low; patient doses can be decreased in the panoramic examinations by increasing the knowledge of health workers of the radiation parameters, specifically operators. https://fbt.tums.ac.ir/index.php/fbt/article/view/828 https://fbt.tums.ac.ir/index.php/fbt/article/download/828/570