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Energy dependence measurement of small-type optically stimulated luminescence (OSL) dosimeter by means of characteristic X-rays induced with general diagnostic X-ray equipment

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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.

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Authors and Affiliations

  1. Graduate School of Health Sciences, Tokushima University, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Kazuki Takegami & Hiroki Okino

  2. Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Hiroaki Hayashi & Yuki Kanazawa

  3. School of Health Sciences, Tokushima University, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Natsumi Kimoto & Itsumi Maehata

  4. Nagase Landauer, LTD, C22-1 Suwa, Tsukuba, Ibaraki, 300-2686, Japan

    Tohru Okazaki, Takuya Hashizume & Ikuo Kobayashi

Authors
  1. Kazuki Takegami
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  2. Hiroaki Hayashi
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  3. Hiroki Okino
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  4. Natsumi Kimoto
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  5. Itsumi Maehata
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  6. Yuki Kanazawa
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  7. Tohru Okazaki
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  8. Takuya Hashizume
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  9. Ikuo Kobayashi
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Corresponding author

Correspondence to Hiroaki Hayashi.

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Conflict of interest

T. Okazaki, T. Hashizume, and I. Kobayashi are employees of Nagase Landauer, Ltd., and are collaborating researchers.

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Takegami, K., Hayashi, H., Okino, H. et al. Energy dependence measurement of small-type optically stimulated luminescence (OSL) dosimeter by means of characteristic X-rays induced with general diagnostic X-ray equipment. Radiol Phys Technol 9, 99–108 (2016). https://doi.org/10.1007/s12194-015-0339-9

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  • DOI: https://doi.org/10.1007/s12194-015-0339-9

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