Evaluation of Optimum Room Entry Times for Radiation Therapists after High Energy Whole Pelvic Photon Treatments

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著者

    • HO Lavine HO Lavine
    • Department of Health Technology and Informatics, The Hong Kong Polytechnic University
    • CHAN Kim
    • Department of Health Technology and Informatics, The Hong Kong Polytechnic University
    • NG Janet
    • Department of Health Technology and Informatics, The Hong Kong Polytechnic University
    • TAM Timothy
    • Department of Health Technology and Informatics, The Hong Kong Polytechnic University

抄録

Objectives: Linear accelerators operating at or above 10 MV produce neutrons by photonuclear reactions and induce activation in machine components, which are a source of potential exposure for radiation therapists. This study estimated gamma dose contributions to radiation therapists during high energy, whole pelvic, photon beam treatments and determined the optimum room entry times, in terms of safety of radiation therapists. Methods: Two types of technique (anterior-posterior opposing and 3-field technique) were studied. An Elekta Precise treatment system, operating up to 18 MV, was investigated. Measurements with an area monitoring device (a Mini 900R radiation monitor) were performed, to calculate gamma dose rates around the radiotherapy facility. Measurements inside the treatment room were performed when the linear accelerator was in use. The doses received by radiation therapists were estimated, and optimum room entry times were determined. Results: The highest gamma dose rates were approximately 7 μSv/h inside the treatment room, while the doses in the control room were close to background (~0 μSv/h) for all techniques. The highest personal dose received by radiation therapists was estimated at 5 mSv/yr. To optimize protection, radiation therapists should wait for up to11 min after beam-off prior to room entry. Conclusions: The potential risks to radiation therapists with standard safety procedures were well below internationally recommended values, but risks could be further decreased by delaying room entry times. Dependent on the technique used, optimum entry times ranged between 7 to 11 min. A balance between moderate treatment times versus reduction in measured equivalent doses should be considered.

収録刊行物

  • Journal of occupational health

    Journal of occupational health 54(2), 131-140, 2012-03-01

    公益社団法人 日本産業衛生学会

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各種コード

  • NII論文ID(NAID)
    10030138993
  • NII書誌ID(NCID)
    AA11090645
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13419145
  • NDL 記事登録ID
    023556763
  • NDL 請求記号
    Z54-J76
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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