title: OSL and TL techniques combined in a beryllium oxide detector to evaluate simultaneously accumulated and single doses.
abstract: Optically stimulated luminescence (OSL) and thermoluminescence (TL) are similar techniques widely used in radiation dosimetry. The main difference between these techniques is the stimulus to induce luminescence emission: TL technique uses thermal stimulation, whereas OSL uses optical stimulation. One of the main intrinsic characteristics of the OSL technique is the possibility of reading several times the dosimetric materials with a negligible loss of signal. In the case of BeO, recent studies have shown that TL stimulation up to 250°C does not affect its OSL signal. Taking the advantages of dosimetric characteristics of BeO combined with both techniques, in this study, we demonstrated the possibility of measuring accumulated and single doses in the same BeO-based detector in order to use it to improve individual monitoring of radiation workers exposed to X-ray or gamma-ray fields. Single doses were measured using TL technique by heating the detector up to 250°C, whereas accumulated doses were estimated using OSL technique in the same detector in a relatively short time of optical stimulation. The detectors were exposed to two energies: 28keV X-rays and 1.25MeV Co-60 gamma rays. The doses estimated by OSL and TL of BeO (Thermalox 995) were compared with those obtained with LiF (TLD-100) and recorded with a calibrated ionization chamber. The results indicate that combined OSL and TL signals of BeO detectors can provide additional information of accumulated dose, with additional exploration of the advantages of both techniques, such as speed in readouts with OSL, and double-check the doses using TL and OSL intensities from BeO.
authors.affiliation: Biomedical Engineering Department, School of Electrical and Computer Engineering, Campinas State University, Campinas, Sao Paulo, Brazil. Electronic address: annaluizacruz@gmail.com.
authors.forename: Anna L M C
authors.initials: ALMC
authors.lastname: Malthez
authors.affiliation: Health Informatics Department, Federal University of São Paulo, Sao Paulo, Brazil.
authors.forename: Marcelo B
authors.initials: MB
authors.lastname: Freitas
authors.affiliation: Nuclear Physics Department, University of São Paulo, Sao Paulo, Brazil.
authors.forename: Elisabeth M
authors.initials: EM
authors.lastname: Yoshimura
authors.affiliation: Nuclear Physics Department, University of São Paulo, Sao Paulo, Brazil.
authors.forename: Nancy K
authors.initials: NK
authors.lastname: Umisedo
authors.affiliation: Biomedical Engineering Department, School of Electrical and Computer Engineering, Campinas State University, Campinas, Sao Paulo, Brazil.
authors.forename: Vera L S N
authors.initials: VLSN
authors.lastname: Button
mesh_terms: D001608:Beryllium; D002138:Calibration; D005720:Gamma Rays; D006801:Humans; D016273:Occupational Exposure; D062791:Optically Stimulated Luminescence Dosimetry / Q000379:methods*; D011829:Radiation Dosage; D011874:Radiometry; D013819:Thermoluminescent Dosimetry / Q000379:methods*; D014965:X-Rays
chemical_list: C032777:beryllium oxide; D001608:Beryllium
keywords: Beryllium oxide detector; Optically stimulated luminescence; Personal dosimetry; Thermally stimulated luminescence