A Gaussian-plume based Monte Carlo method for calculating radiation dose in the near field of buildings.

IF 1.4 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES
D J Gallacher, A G Robins, P Hayden
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引用次数: 0

Abstract

A Monte Carlo (MC) programme was written using the dose point kernel method to calculate doses in the roof zone of a building from nearby releases of radioactive gases. A Gaussian Plume Model (GPM) was parameterised to account for near-field building effects on plume spread and reflection from the roof. Rooftop recirculation zones and building-generated plume spread effects were accounted in a novel Dual Gaussian Plume (DGP) formulation used with the MC model, which allowed for the selection of angle of approach flow, plume release height in relation to the building and position of the release point in relation to the leading edge of the building. Three-dimensional wind tunnel concentration field data were used for the parameterisation. The MC code used the parameterised concentration field to calculate the contributions to effective dose from inhalation, cloud immersion from positron/beta particles, and gamma-ray dose for a wide range of receptor dose positions in the roof zone, including receptor positions at different heights above the roof. Broad trends in predicted radiation dose with angle of approach flow, release position in relation to the building and release height are shown. Alternative approaches for the derivation of the concentration field are discussed.

基于高斯体积的蒙特卡洛方法,用于计算建筑物近场的辐射剂量。
使用剂量点核法编写了一个蒙特卡罗(MC)程序,以计算附近放射性气体释放对建筑物屋顶区造成的剂量。对高斯烟羽模型(GPM)进行了参数化,以考虑近场建筑物对烟羽扩散和屋顶反射的影响。屋顶再循环区和建筑物产生的烟羽扩散效应在与 MC 模型一起使用的新型双高斯烟羽 (DGP) 公式中得到了考虑,该公式允许选择接近流的角度、烟羽相对于建筑物的释放高度以及释放点相对于建筑物前缘的位置。三维风洞浓度场数据用于参数化。MC 代码使用参数化的浓度场来计算吸入的有效剂量、正电子/β 粒子的云浸以及屋顶区域各种受体剂量位置(包括屋顶上方不同高度的受体位置)的伽马射线剂量。图中显示了预测辐射剂量随气流接近角度、与建筑物的释放位置和释放高度变化的大致趋势。讨论了推导浓度场的其他方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Radiological Protection
Journal of Radiological Protection 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
2.60
自引率
26.70%
发文量
137
审稿时长
18-36 weeks
期刊介绍: Journal of Radiological Protection publishes articles on all aspects of radiological protection, including non-ionising as well as ionising radiations. Fields of interest range from research, development and theory to operational matters, education and training. The very wide spectrum of its topics includes: dosimetry, instrument development, specialized measuring techniques, epidemiology, biological effects (in vivo and in vitro) and risk and environmental impact assessments. The journal encourages publication of data and code as well as results.
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