title: INTERCOMPARISON ON THE MEASUREMENT OF THE QUANTITY PERSONAL DOSE EQUIVALENT HP(10) IN PHOTON FIELDS. LINEARITY DEPENDENCE, LOWER LIMIT OF DETECTION AND UNCERTAINTY IN MEASUREMENT OF DOSIMETRY SYSTEMS OF INDIVIDUAL MONITORING SERVICES IN GABON AND GHANA.
abstract: An inter-comparison study was conducted to assess the capability of dosimetry systems of individual monitoring services (IMSs) in Gabon and Ghana to measure personal dose equivalent Hp(10) in photon fields. The performance indicators assessed were the lower limit of detection, linearity and uncertainty in measurement. Monthly and quarterly recording levels were proposed with corresponding values of 0.08 and 0.025 mSv, and 0.05 and 0.15 mSv for the TLD and OSL systems, respectively. The linearity dependence of the dosimetry systems was performed following the requirement given in the Standard IEC 62387 of the International Electrotechnical Commission (IEC). The results obtained for the two systems were satisfactory. The procedure followed for the uncertainty assessment is the one given in the IEC technical report TR62461. The maximum relative overall uncertainties, in absolute value, expressed in terms of Hp(10), for the TL dosimetry system Harshaw 6600, are 44. 35% for true doses below 0.40 mSv and 36.33% for true doses ≥0.40 mSv. For the OSL dosimetry system microStar, the maximum relative overall uncertainties, in absolute value, are 52.17% for true doses below 0.40 mSv and 37.43% for true doses ≥0.40 mSv. These results are in good agreement with the requirements for accuracy of the International Commission on Radiological protection. When expressing the uncertainties in terms of response, comparison with the IAEA requirements for overall accuracy showed that the uncertainty results were also acceptable. The values of Hp(10) directly measured by the two dosimetry systems showed a significant underestimation for the Harshaw 6600 system, and a slight overestimation for the microStar system. After correction for linearity of the measured doses, the two dosimetry systems gave better and comparable results.
authors.affiliation: General Directorate of Nuclear Techniques (DGTN), Ministry of Energy and Water Resources, BP 1172 Libreville, Gabon.|School of Nuclear and Allied Sciences (SNAS), Department of Medical Physics, PO Box AE1, Atomic-Accra, Ghana.
authors.forename: P
authors.initials: P
authors.lastname: Ondo Meye
authors.affiliation: School of Nuclear and Allied Sciences (SNAS), Department of Medical Physics, PO Box AE1, Atomic-Accra, Ghana.
authors.forename: C
authors.initials: C
authors.lastname: Schandorf
authors.affiliation: School of Nuclear and Allied Sciences (SNAS), Department of Medical Physics, PO Box AE1, Atomic-Accra, Ghana.|Radiation Protection Institute (RPI), Ghana Atomic Energy Commission (GAEC), PO Box LG 80, Atomic-Accra, Ghana.
authors.forename: J K
authors.initials: JK
authors.lastname: Amoako
authors.affiliation: Radiation Protection Institute (RPI), Ghana Atomic Energy Commission (GAEC), PO Box LG 80, Atomic-Accra, Ghana.
authors.forename: P O
authors.initials: PO
authors.lastname: Manteaw
authors.affiliation: Radiation Protection Institute (RPI), Ghana Atomic Energy Commission (GAEC), PO Box LG 80, Atomic-Accra, Ghana.
authors.forename: E A
authors.initials: EA
authors.lastname: Amoatey
authors.affiliation: Radiation Protection Institute (RPI), Ghana Atomic Energy Commission (GAEC), PO Box LG 80, Atomic-Accra, Ghana.
authors.forename: D N
authors.initials: DN
authors.lastname: Adjei
mesh_terms: D005681:Gabon; D005869:Ghana; D006801:Humans; D057230:Limit of Detection; D017785:Photons; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000295:instrumentation*; D035501:Uncertainty