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  • [J Radiol Prot.] Radon in Brazilian underground mines.

    University of São Paulo / Ayres da Silva ALM*

  • 출처
    J Radiol Prot.
  • 등재일
    2018 Jun
  • 저널이슈번호
    38(2):607-620. doi: 10.1088/1361-6498/aaaf45. Epub 2018 Feb 14.
  • 내용

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    Abstract
    Radon is a chemically inert noble radioactive gas found in several radioactive decay chains. In underground mines, especially those that contain or have contained ores associated with uranium-bearing minerals, workers might be exposed to high levels of radon and its decay products (RDP). This work aims to investigate whether the exposure of workers to radon gas and its progeny has been evaluated in Brazilian non-uranium and non-thorium underground mines. Any such results and control measures undertaken or recommended to maintain concentrations under Brazilian occupational exposure limits (OELs) are documented. The methodology we adopted consists of three main phases. The first was an extensive bibliographical survey of the concentration levels of radon and RDP, as well as the radiation dose estimates, considering measurements made heretofore by various Brazilian researchers and exhibiting original measurement work undertaken by the one of the authors (mine O). In the second phase, the values obtained were compared with OELs. In the third phase, any control measures undertaken in mines with high exposure of workers to radon and its progeny were verified, and the adopted controls were determined. Radon concentration data obtained from 52 campaigns in 40 underground mines were analyzed. The results show that assessment of the exposure of workers to radon and its progeny was undertaken in many mines at least once, and that radon levels in 62.5% of the mines, when visited for the first time, were below the Brazilian OELs. As expected, the main control measure adopted or recommended was improvement of the ventilation system.

     

     
    Author information

    Ayres da Silva ALM, de Eston SM, Iramina WS, Diegues Francisca D.

  • 편집위원

    본 논문은 2018년 3월 Journal of radiological protection에 개제된 논문으로 브라질 광산에서 근무하는 작업자들의 라돈에 의한 피폭선량을 평가한 논문임. 작업자의 연간 유효선량은 공기중 라돈의 concentration (Bq/m3)값과 작업시간(t), 그리고 작업장의 equilibriumfactor(F)를 사용하여 평가되었으며, 계산된 연간 유효선량은 Brazilian occupational exposure limits (OELs)와 비교평가 되었다. 선량평가 결과 대부분 브라질 광산의 작업자 연간 유효선량은 브라질의 OEL 수치보다 62.5% 낮게 평가되었으며 이는 작업장 내부의 환기 시스템이 잘 작동 되고 있다는 것을 의미한다고 기술되었다. 최근 라돈침대와 같은 천연방사성핵종이 포함된 가공제품들의 제작 및 유통으로 인한 사건사고들이 큰 관심사로 떠오르고 있기 때문에 본 연구에서 수행한 피폭선량 평가방법은 국내에서도 적용할 수 있을 것으로 예상됨.

    2018-08-28 12:00:07

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