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  • [Radiation Measurements] Thermoluminescence of AMOLED substrate glasses in recent mobile phones for retrospective dosimetry

    [Radiation Measurements] Thermoluminescence of AMOLED substrate glasses in recent mobile phones for retrospective dosimetry사후선량평가를 위한 최신 휴대폰의 AMOLED 기판유리에 대한 열형광특성 분석

    KAERI / 김형택*

  • 출처
    Radiation Measurements
  • 등재일
    March 2019
  • 저널이슈번호
    Volume 122, Pages 53-56
  • 내용

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    그림) 종류에 따른 AMOLED 기판 유리의 열발광 스펙트럼과 컨투어

     

    Abstract
    Forty mobile phones using active-matrix organic light-emitting diode(AMOLED) display glasses were tested as emergency dosimeters. The target material was a substrate glass for AMOLED layers located under a cover glass. The measured thermoluminescence (TL) emission spectraand glow curves showed that the glasses are all included in category A and B of a previous study, and the ratio between category A and B was about 8 to 2 for all measured samples. A pre-bleach was applied for 500 s, and TL signals were acquired by measuring the whole wavelength region by removing a UV filter (U-340). This was possible in the same measurement sequence by modifying the Risø TL/OSL DA-20 reader in such a way, that the LED module, used for pre-bleaching, is separated from the detector unit, used for the TL measurement. The signal increase after removing the filter was approximately 50 and 90 times for category A and B, respectively. The zero dose distribution with an average of 34 mGy and a minimal detectable dose (3σ) of 90 mGy was recorded for the forty mobile phones. The position distribution of zero doses across the entire substrate glass of a phone showed a standard deviation of more than 60% for three phone samples. Linear dose response from 30 mGy to 10 Gy was observed, and fading data of the TL signal from glass samples of 22 mobile phones assessed, for up to twenty days after irradiation.

     

    Author information

    Hyoung taek Kim a, Min Chae Kim a b, Jung il Lee a, In su Chang a, Seung Kyu Lee a, Jang-Lyul Kim a


    Radiation Dosimetry Team, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon, 34057, Republic of Korea
    b
    Department of Nuclear Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea

     

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  • 연구소개
    본 연구는 대규모 방사선 피폭 사고 혹은 테러 발생 시 선량계를 소지하지 않은 일반인의 피폭 여부를 확인하기 위해, 개인휴대품의 특정 물질에 열발광/광자극발광 기법을 적용하여 피폭된 선량값을 산출하고 환자가 적합한 의료적 처치를 받을 수 있도록 하는 기술입니다.
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