Conversion of simulated radioactive pollutant gas concentrations for a complex building array into radiation dose. (21st September 2016)

• Record Type: Journal Article
• Authors: Gallacher, D J; Robins, A G; Hayden, P
• Is Part Of: Journal of radiological protection. Volume 36:Number 4(2016:Dec.)
• Page Start: 785
• Page End: 818
• Publication Date: 2016-09-21
• Subjects: radiation dose -- wind tunnel -- ADMS -- positron -- PET -- plume -- building; Radiation -- Safety measures -- Periodicals; Health Physics -- Periodicals; Radiation Monitoring -- Periodicals; Radiation Protection -- Periodicals; Rayonnement -- Sécurité -- Mesures -- Périodiques; Electronic journals; Fulltext; Internet Resource; Periodical; 363.179905
• DOI: 10.1088/0952-4746/36/4/785
• Languages: English
• ISSNs: 0952-4746

Abstract

Abstract: Methods used to convert wind tunnel and ADMS concentration field data for a complex building array into effective radiation dose were developed based on simulations of a site in central London. Pollutant source terms were from positron emitting gases released from a cyclotron and clinical PET radiotracer facility. Five years of meteorological data were analysed to determine the probability distribution of wind direction and speed. A hemispherical plume cloud model (both static and moving) was developed which enabled an expression of gamma-ray dose, taking into account build-up factors in air, in terms of analytic functions in this geometry. The standard building wake model is presented, but this is extended and developed in a new model to cover the concentration field in the vicinity of a roof top structure recirculation zone, which is then related to the concentration in the main building wake zone. For all models presented the effective dose was determined from inhalation, positron cloud immersion and gamma ray plume contributions. Results of applying these models for determination of radiation dose for a particular site are presented elsewhere.