title: Energy dependence measurement of small-type optically stimulated luminescence (OSL) dosimeter by means of characteristic X-rays induced with general diagnostic X-ray equipment.
abstract: For X-ray inspections by way of general X-ray equipment, it is important to measure an entrance-skin dose. Recently, a small optically stimulated luminescence (OSL) dosimeter was made commercially available by Landauer, Inc. The dosimeter does not interfere with the medical images; therefore, it is expected to be a convenient detector for measuring personal exposure doses. In an actual clinical situation, it is assumed that X-rays of different energies will be detected by a dosimeter. For evaluation of the exposure dose measured by a dosimeter, it is necessary to know the energy dependence of the dosimeter. Our aim in this study was to measure the energy dependence of the OSL dosimeter experimentally in the diagnostic X-ray region. Metal samples weighing several grams were irradiated and, in this way, characteristic X-rays having energies ranging from 8 to 85 keV were generated. Using these mono-energetic X-rays, the dosimeter was irradiated. Simultaneously, the fluence of the X-rays was determined with a CdTe detector. The energy-dependent efficiency of the dosimeter was derived from the measured value of the dosimeter and the fluence. Moreover, the energy-dependent efficiency was calculated by Monte-Carlo simulation. The efficiency obtained in the experiment was in good agreement with that of the simulation. In conclusion, our proposed method, in which characteristic X-rays are used, is valuable for measurement of the energy dependence of a small OSL dosimeter in the diagnostic X-ray region.
authors.affiliation: Graduate School of Health Sciences, Tokushima University, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan.
authors.forename: Kazuki
authors.initials: K
authors.lastname: Takegami
authors.affiliation: Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan. hayashi.hiroaki@tokushima-u.ac.jp.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Hayashi
authors.affiliation: Graduate School of Health Sciences, Tokushima University, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Okino
authors.affiliation: School of Health Sciences, Tokushima University, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan.
authors.forename: Natsumi
authors.initials: N
authors.lastname: Kimoto
authors.affiliation: School of Health Sciences, Tokushima University, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan.
authors.forename: Itsumi
authors.initials: I
authors.lastname: Maehata
authors.affiliation: Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kanazawa
authors.affiliation: Nagase Landauer, LTD, C22-1 Suwa, Tsukuba, Ibaraki, 300-2686, Japan.
authors.forename: Tohru
authors.initials: T
authors.lastname: Okazaki
authors.affiliation: Nagase Landauer, LTD, C22-1 Suwa, Tsukuba, Ibaraki, 300-2686, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Hashizume
authors.affiliation: Nagase Landauer, LTD, C22-1 Suwa, Tsukuba, Ibaraki, 300-2686, Japan.
authors.forename: Ikuo
authors.initials: I
authors.lastname: Kobayashi
mesh_terms: D049449:Luminescence; D009010:Monte Carlo Method; D055096:Optical Devices; D011874:Radiometry / Q000295:instrumentation*; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*; D014965:X-Rays
keywords: Characteristic X-ray; Energy dependence; Monte-Carlo simulation; Optically stimulated luminescence dosimeter