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首页> 外文期刊>Journal of Environmental Radioactivity >Radon dispersion modeling and dose assessment for uranium mine ventilation shaft exhausts under neutral atmospheric stability
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Radon dispersion modeling and dose assessment for uranium mine ventilation shaft exhausts under neutral atmospheric stability

机译：中性大气稳定性下铀矿通风井尾气的dispersion散模型与剂量估算

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摘要

In the present study, the roles of atmospheric wind profiles in the neutral atmosphere and surface roughness parameters in a complex terrain were examined to determine their impacts on radon (~(222)Rn) dispersion from an actual uranium mine ventilation shaft. Simulations were completed on ~(222)Rn dispersion extending from the shaft to a vulnerable distance, near the location of an occupied farmhouse. The eight dispersion scenarios for the ventilation shaft source included four downwind velocities (0.5, 1.0, 2.0 and 4.0 m s~(-1)) and two underlying surface roughness characteristics (0.1 m and 1.0 m). ~(222)Rn distributions and elevated pollution regions were identified. Effective dose estimation methods involving a historical weighting of wind speeds in the direction of interest coupled to the complex dispersion model were proposed. Using this approach, the radiation effects on the residents assumed to be outside at the location of the farm house 250 m downwind from the ventilation shaft outlet were computed. The maximum effective dose rate calculated for the residents at the outside of the farm house was 2.2 mSv y~(-1), which is less than the low limit action level of 3-10 mSv y~(-1) recommended by the International Commission on Radiological Protection (ICRP) occupational exposure action level for radon.
机译：在本研究中，研究了大气风廓线在中性大气中的作用以及复杂地形中的表面粗糙度参数，以确定它们对实际铀矿通风井中ra（〜（222）Rn）扩散的影响。对〜（222）Rn色散的模拟已完成，该色散从竖井延伸到易受影响的距离，靠近被占用农舍的位置。通风竖井源的八个散布情景包括四个顺风速度（0.5、1.0、2.0和4.0 m s〜（-1））和两个基础表面粗糙度特征（0.1 m和1.0 m）。确定了〜（222）Rn分布和高污染区域。提出了一种有效的剂量估算方法，该方法涉及在感兴趣方向上对风速进行历史加权，并与复数色散模型耦合。使用这种方法，计算了从通风竖井出风口向下游250 m处的农舍外部居民的辐射影响。针对农舍外部居民的最大有效剂量率为2.2 mSv y〜（-1），低于国际建议的下限作用水平3-10 mSv y〜（-1）。放射防护委员会（ICRP）ra的职业暴露行动水平。

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  • 来源
    《Journal of Environmental Radioactivity》 |2014年第3期|57-62|共6页
  • 作者

    Dong Xie; Hanqing Wang; Kimberlee J. Kearfott; Zehua Liu; Shunquan Mo;

  • 作者单位

    School of Energy Science and Engineering, Central South University, Changsha 410083, China,School of Urban Construction, University of South China, Hengyang 421001, China;

    School of Civil Engineering, University of Hunan Technology, Zhuzhou 412007, China;

    Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109-2104, USA;

    School of Urban Construction, University of South China, Hengyang 421001, China;

    School of Urban Construction, University of South China, Hengyang 421001, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ~(222)Rn release; Atmospheric dispersion; Numerical modeling; Radiation dose evaluation;

    机译：〜（222）Rn释放;大气弥散;数值建模;辐射剂量评估;

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