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  • Type-testing of the TLD sys...
    Stanković Petrović, Jelena; Danilović, Nataša; Kržanović, Nikola; Topalović, Dušan; Živanović, Miloš; Božović, Predrag; Todorović, Nataša; Nikolov, Jovana

    Radiation measurements, November 2023, 2023-11-00, Letnik: 168
    Journal Article

    Individual monitoring service at the Department for Radiation and Environmental Protection of Vinca Institute of Nuclear Sciences performs individual whole-body and extremities monitoring of exposed workers, using thermoluminescent dosimetry (TLD) method. The dosemeters for eye-lens personal dose equivalent measurements, Hp(3), are not regularly used at the workplaces in Serbia, even though the individual monitoring method is accredited and available at the dosimetry service. Type testing of Hp(3) dosemeters based on LiF: Mg,Ti, placed in modified ring holders was done following the changes in ISO 4037:2019 and IEC 62387:2020. The type testing was done by varying radiation-based influence quantities: photon energies ranging from 33.3 keV up to 1.25 MeV, angle of incidence values of 0°, 45°, 60°, 75°, dose range from 0.05 mSv to 10 Sv. The results show that the passive dosimetry monitoring system satisfies IEC 62387:2020 requirements in the mandatory range of influence quantities, except for the lowest tested energy of 33 keV, when incident radiation angle is ±60° and higher. •Recent changes in ISO 4037 and IEC 62387 prompted new type testing of TLD system.•Introduction of 20 mSv annual limit brought focus to the eye lens dose monitoring.•TLD system that measures Hp(3) due to photon radiation was tested.•Values of CoV limit the use of the system in the dose range from 0.3 mSv to 1 Sv.•System showed unsatisfactory overresponse for more than 60° incident angle.