Performance Evaluation of a Thermo-luminescent Dosimetry System for Occupational Monitoring in Federal Teaching Hospital Katsina, Nigeria

Résumé

Thermo-luminescent dosimeters (TLDs) are widely used for occupational radiation monitoring due to their sensitivity, reusability, and tissue equivalence. This study evaluates the performance of a TLD system deployed at the Federal Teaching Hospital, Katsina, Nigeria. Key performance parameters assessed include batch homogeneity, reproducibility, and dose linearity in accordance with IEC 1066 standards. The homogeneity test yielded a percentage variation of 13.3%, well within the acceptable limit of 30%. Reproducibility analysis yielded a coefficient of variation of 7.71%, which is slightly above the IEC threshold of 7.5%. The dose linearity is in good agreement with irradiated dose values, with deviations ranging from 1.3% to 8.0% and a regression coefficient (R²) of 0.9985, indicating excellent linearity. Overall, the system exhibits reliable performance for occupational monitoring, with minor deviations attributable to environmental and operational factors. Continuous quality assurance is recommended to ensure sustained compliance with international standards.

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