Quantitative and qualitative study of airborne radioactive particles in the safety chamber of Tehran Research Reactor
Background and Aims : Many systems and processes can cause the introduction of radioactivity into the environment. Human activities in nuclear industry such as nuclear fuel cycle and reactor operation, lead to a significant production and release of radioactivity to the environment. Understanding th...
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| Format: | Article |
| Language: | fas |
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Iran University of Medical Sciences
2013-05-01
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| Series: | Salāmat-i kār-i Īrān |
| Subjects: | |
| Online Access: | http://ioh.iums.ac.ir/article-1-725-en.html |
| _version_ | 1818617402460471296 |
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| author | R yarahmadi G.R Moradi asghar sadighzadeh B Rezaeifard ali asghar farshad shahnaz bakand bahram salimi |
| author_facet | R yarahmadi G.R Moradi asghar sadighzadeh B Rezaeifard ali asghar farshad shahnaz bakand bahram salimi |
| author_sort | R yarahmadi |
| collection | DOAJ |
| description | Background and Aims : Many systems and processes can cause the introduction of radioactivity into the environment. Human activities in nuclear industry such as nuclear fuel cycle and reactor operation, lead to a significant production and release of radioactivity to the environment. Understanding the physical and chemical nature, including size, chemical composition and radioactivity of aerosol particles in the safety chamber of Tehran research reactor is indispensable for evaluation of exposure level and methods of prevention. The aim of this study was to measure the size distribution of aerosols and their activities, which was determined using an Anderson cascade Impactor (ACI) ACFM model and liquid scintillation respectively. The measurements were performed in three workstations in the safety chamber of Tehran research reactor. Methods: The identification of existing radio nuclides on suspended particles were carried out in the safety chamber by means of environmental sampler and mass size distribution of particles was measured using an Anderson cascade Impactor (ACI). To determine the type and amount of radio nuclides in the aerosol particles the γ-ray spectrometry with a high –purity germanium (HPGe) detector and ultra-low level liquid scintillation spectrometer were used respectively. Results : The results showed that the activities median aerodynamic diameter (AMAD) value for three selected workstations were 2.4, 3.1 and 3µm with geometric standard deviation of 2.3, 2.12 and 2 respectively. Furthermore, the results of particle activity size distribution showed that the most fraction of activity was related to nucleation and accumulation mode, especially particles with the aerodynamic diameter less than 0.4µm. Conclusion: The most activity was related to the number of particles in the accumulation and nucleation mode (fine particles). The origin of these particles can be the coagulation of particles in the nucleation mode. The accumulation mode also contains droplets formed by the chemical conversion of gases to vapors that condense. |
| first_indexed | 2024-12-16T17:05:08Z |
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| id | doaj.art-03a8e11d4b6c4372938c0e59d4cbfbbe |
| institution | Directory Open Access Journal |
| issn | 1735-5133 2228-7493 |
| language | fas |
| last_indexed | 2024-12-16T17:05:08Z |
| publishDate | 2013-05-01 |
| publisher | Iran University of Medical Sciences |
| record_format | Article |
| series | Salāmat-i kār-i Īrān |
| spelling | doaj.art-03a8e11d4b6c4372938c0e59d4cbfbbe2022-12-21T22:23:37ZfasIran University of Medical SciencesSalāmat-i kār-i Īrān1735-51332228-74932013-05-011051019Quantitative and qualitative study of airborne radioactive particles in the safety chamber of Tehran Research ReactorR yarahmadi0G.R Moradi1asghar sadighzadeh2B Rezaeifard3ali asghar farshad4shahnaz bakand5bahram salimi6 Atomic Energy Organization of Iran Atomic Energy Organization of Iran Background and Aims : Many systems and processes can cause the introduction of radioactivity into the environment. Human activities in nuclear industry such as nuclear fuel cycle and reactor operation, lead to a significant production and release of radioactivity to the environment. Understanding the physical and chemical nature, including size, chemical composition and radioactivity of aerosol particles in the safety chamber of Tehran research reactor is indispensable for evaluation of exposure level and methods of prevention. The aim of this study was to measure the size distribution of aerosols and their activities, which was determined using an Anderson cascade Impactor (ACI) ACFM model and liquid scintillation respectively. The measurements were performed in three workstations in the safety chamber of Tehran research reactor. Methods: The identification of existing radio nuclides on suspended particles were carried out in the safety chamber by means of environmental sampler and mass size distribution of particles was measured using an Anderson cascade Impactor (ACI). To determine the type and amount of radio nuclides in the aerosol particles the γ-ray spectrometry with a high –purity germanium (HPGe) detector and ultra-low level liquid scintillation spectrometer were used respectively. Results : The results showed that the activities median aerodynamic diameter (AMAD) value for three selected workstations were 2.4, 3.1 and 3µm with geometric standard deviation of 2.3, 2.12 and 2 respectively. Furthermore, the results of particle activity size distribution showed that the most fraction of activity was related to nucleation and accumulation mode, especially particles with the aerodynamic diameter less than 0.4µm. Conclusion: The most activity was related to the number of particles in the accumulation and nucleation mode (fine particles). The origin of these particles can be the coagulation of particles in the nucleation mode. The accumulation mode also contains droplets formed by the chemical conversion of gases to vapors that condense.http://ioh.iums.ac.ir/article-1-725-en.htmlaerosol particles activitysize distributionmass concentrationliquid scintillationteharn reactor |
| spellingShingle | R yarahmadi G.R Moradi asghar sadighzadeh B Rezaeifard ali asghar farshad shahnaz bakand bahram salimi Quantitative and qualitative study of airborne radioactive particles in the safety chamber of Tehran Research Reactor Salāmat-i kār-i Īrān aerosol particles activity size distribution mass concentration liquid scintillation teharn reactor |
| title | Quantitative and qualitative study of airborne radioactive particles in the safety chamber of Tehran Research Reactor |
| title_full | Quantitative and qualitative study of airborne radioactive particles in the safety chamber of Tehran Research Reactor |
| title_fullStr | Quantitative and qualitative study of airborne radioactive particles in the safety chamber of Tehran Research Reactor |
| title_full_unstemmed | Quantitative and qualitative study of airborne radioactive particles in the safety chamber of Tehran Research Reactor |
| title_short | Quantitative and qualitative study of airborne radioactive particles in the safety chamber of Tehran Research Reactor |
| title_sort | quantitative and qualitative study of airborne radioactive particles in the safety chamber of tehran research reactor |
| topic | aerosol particles activity size distribution mass concentration liquid scintillation teharn reactor |
| url | http://ioh.iums.ac.ir/article-1-725-en.html |
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