DOI: 10.1016/j.atmosenv.2014.01.007
Scopus记录号: 2-s2.0-84896889247
论文题名: An unconventional adaptation of a classical Gaussian plume dispersion scheme for the fast assessment of external irradiation from a radioactive cloud
作者: Pecha P ; , Pechova E
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 89 起始页码: 298
结束页码: 308
语种: 英语
英文关键词: Atmospheric dispersion
; Cloudshine dose
; Photon fluence
Scopus关键词: Atmospheric dispersion
; Cloudshine dose
; Computational process
; Dose conversion factor
; Effective algorithms
; Near-field dispersions
; Numerical integrations
; Photon fluence
; Algorithms
; Atmospheric movements
; Dispersions
; Irradiation
; Neutron emission
; Photons
; Radioactivity
; Gaussian distribution
; radioisotope
; algorithm
; atmospheric plume
; cloud cover
; data assimilation
; dispersion
; Gaussian method
; irradiance
; radioactive pollution
; radioactivity
; radionuclide
; acceleration
; article
; atmosphere
; boundary layer
; calculation
; cloud
; comparative study
; computer simulation
; decomposition
; dosimetry
; dynamics
; energy absorption
; forecasting
; gamma radiation
; ionizing radiation
; irradiation
; kernel method
; meteorology
; photon
; plume
; plume dispersion
; priority journal
; radiation accident
; radiation protection
; radioactivity
; wind
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: This article focuses on derivation of an effective algorithm for the fast estimation of cloudshine doses/dose rates induced by a large mixture of radionuclides discharged into the atmosphere. A certain special modification of the classical Gaussian plume approach is proposed for approximation of the near-field dispersion problem. Specifically, the accidental radioactivity release is subdivided into consecutive one-hour Gaussian segments, each driven by a short-term meteorological forecast for the respective hours. Determination of the physical quantity of photon fluence rate from an ambient cloud irradiation is coupled to a special decomposition of the Gaussian plume shape into the equivalent virtual elliptic disks. It facilitates solution of the formerly used time-consuming 3-D integration and provides advantages with regard to acceleration of the computational process on a local scale. An optimal choice of integration limit is adopted on the basis of the mean free path of γ-photons in the air. An efficient approach is introduced for treatment of a wide range of energetic spectrum of the emitted photons when the usual multi-nuclide approach is replaced by a new multi-group scheme. The algorithm is capable of generating the radiological responses in a large net of spatial nodes. It predetermines the proposed procedure such as a proper tool for online data assimilation analysis in the near-field areas. A specific technique for numerical integration is verified on the basis of comparison with a partial analytical solution. Convergence of the finite cloud approximation to the tabulated semi-infinite cloud values for dose conversion factors was validated. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80652
Appears in Collections: 气候变化事实与影响
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作者单位: Institute of Information Theory and Automation of the Czech Academy of Sciences, v.v.i., Pod Vodarenskou vezi 4, 182 08 Prague 8, Czech Republic; Institute of Nuclear Research, Div. EGP, 250 68 Rez near Prague, Czech Republic
Recommended Citation:
Pecha P,, Pechova E. An unconventional adaptation of a classical Gaussian plume dispersion scheme for the fast assessment of external irradiation from a radioactive cloud[J]. Atmospheric Environment,2014-01-01,89