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Year : 2018  |  Volume : 41  |  Issue : 2  |  Page : 77-83

Assessment of the performance characteristics of an optically stimulated luminescence dosimetry system in Gabon

1 General Directorate of Radiation Protection and Nuclear Safety, Ministry of Water and Energy, Libreville, Gabon
2 Department of Medical Physics, School of Nuclear and Allied Sciences, Accra, Ghana
3 Département Sciences Physiques, Ecole Normale Supérieure, Libreville, Gabon

Correspondence Address:
Mr. Philippe Ondo Meye
General Directorate of Radiation Protection and Nuclear Safety, Ministry of Water and Energy, BP 1172, Libreville
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/rpe.RPE_28_18

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To ensure the reliability of the performance of the optically stimulated luminescence (OSL) dosimetry system used for individual monitoring of occupationally exposed workers in Gabon, some key performance indicators were evaluated. The performance indicators assessed included: measurement uncertainty, linearity, coefficient of variation, and photon energy and angular dependence. The results for uncertainty assessment were in very good agreement with the International Commission on Radiological Protection (ICRP) and International Atomic Energy Agency (IAEA) requirements for overall accuracy. The maximum relative overall uncertainty in absolute value in the region of the recording level was 45%. In the region beyond the recording level, the maximum relative overall uncertainty was 42% (in absolute value). The results for linearity assessment met the requirement for linearity of International Electrotechnical Commission (IEC) 62387 standard. The results for coefficient of variation assessment were within the relevant requirement of IEC 62387 for doses beyond the recording level. The results obtained for photon energy and angle of incidence were in good agreement with the IAEA and IEC 62387 corresponding requirements. The OSL dosimetry system can be relied on to provide acceptable monitoring data for the individual monitoring service in Gabon.

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