Advertisement

MAPAN

, Volume 33, Issue 2, pp 123–130 | Cite as

A theoretical and experimental investigation of spatial distribution of radon in a typical ventilated room

  • R. Rabi
  • L. Oufni
Original Paper

Abstract

The aim of this work is to studying indoor radon distribution using the Finite Volume Method (FVM). This paper focuses on effects of exhalation from different sources (wall, floor and ceiling) and the ventilation profile on distribution the concentrations of radon indoor. The rate of radon exhalation and ventilation were measured and are used as input in FVM simulation. It has been found that the radon concentration is distributed in non homogeneous way in the room. The radon concentration is much larger near floor, and decreases in the middle of the room. The experimental validation was performed by measuring radon concentration at different locations in room using active and passive techniques. We notice that the results of simulation and experimental are in agreement. The annual effective dose of radon in the model room has been also investigated.

Keywords

Radon SSNTD Exhalation rate Finite Volume Method Radon Scout Plus Radon effective dose 

References

  1. [1]
    F. Steinhausler, Environmental 220Rn: a review, Enviro. Intern., 22 (1996) 1111–1123.CrossRefGoogle Scholar
  2. [2]
    Q. Guo, J. Sun and W. Zhuo, Potential of high thoron exposure in China, J. Nucl. Sci. Technol., 37 (2000) 716–719.CrossRefGoogle Scholar
  3. [3]
    K.K. Dwivedi, R. Mishra, S.P. Tripathy, A. Kulshreshtha, D. Sinha, A. Srivastava, P. Deka, B. Bhattacharjee, T.V. Ramachandran and K.S.V. Nambi, Simultaneous determination of radon, thoron and their progeny in dwellings, Rad. Meas., 33 (2001) 7–11.CrossRefGoogle Scholar
  4. [4]
    S. Singh, A. Kumar and B. Singh, Radon level in dwellings and its correlation with uranium and radium content in some areas of Himachal Pradesh, India. Enviro. Int., 28 (2002) 97–101.Google Scholar
  5. [5]
    T. Iyogi, S. Ueda, S. Hisamatsu, K. Kondo, N. Sakurai and J. Inaba, Radon concentration in indoor occupational environments in Aomori Prefecture, Japan, J. Enviro. Radioact., 67 (2003) 91–108.CrossRefGoogle Scholar
  6. [6]
    M.H. Magalhaes, E.C.S. Amaral, I. Sachett and E.R.R. Rochedo, Radon-222 in Brazil: an outline of indoor and outdoor measurements, J. Enviro. Radioact., 67 (2003) 131–143.CrossRefGoogle Scholar
  7. [7]
    R.S. Saini, M. Nain, R.P. Chauhan, N. Kishore and S.K. Chakarvarti, Radon, thoron and their progeny levels in some dwellings of northern Haryana, India using SSNTDs, India. J. Phys., 83 (2009) 1197–1200.CrossRefADSGoogle Scholar
  8. [8]
    R.W. Field, D.J. Steck, B.J. Smith, C.P. Brus, E.F. Fisher, J.S. Neuberger, C.E. Platz, R.A. Robinson, R.F. Woolson and C.F. Lynch, Residential radon gas exposure and lung cancer, Am. J. Epidemiol., 151 (2000) 1091–1102.CrossRefGoogle Scholar
  9. [9]
    J. Ma, H. Yonehara, T. Aoyama, M. Doi, S. Kobayashi and M. Sakanoue, Influence of air flow on the behaviour of thoron and its progeny in a traditional Japanese house, Health Phys., 72 (1997) 86–91.CrossRefGoogle Scholar
  10. [10]
    [10] W. Jacobi, Activity and Potential Alpha-energy of 222Radon and 220Radon-daughters in Different Air Atmospheres, Health Phys., 22 (1972) 429–507.CrossRefGoogle Scholar
  11. [11]
    J. Postendorfer, A. Wicke and A. Schraub, The influence of exhalation, ventilation and deposition processes upon the concentration of radon (222Rn), thoron (220Rn) and their decay products in room air, Health Phys., 34 (1978) 419–477.CrossRefGoogle Scholar
  12. [12]
    A. Katase, Y. Matsumoto, T. Sakae and K. Ishibashi, Indoor concentrations of 220Rn and its decay products, Health Phys., 54 (1988) 249–344.CrossRefGoogle Scholar
  13. [13]
    T. Yamasaki, Q. Guo and T. Iida, Distributions of thoron progeny concentrations in Dwellings, Radiat. Prot. Dosim., 59 (1995) 135–140.CrossRefGoogle Scholar
  14. [14]
    H.M. Mok, Perturbative method in the indoor radon/thoron concentration study, Radiat. Prot. Dosim., 67 (1996) 65–70.CrossRefGoogle Scholar
  15. [15]
    S. Kato, Appliance of CFDS technique for designing room air distribution—Part 1. Overview of CFD for analyzing indoor climate, Soci. Heat. Air Condi. & Sani. Eng. Jap., 71 (1997) 533–542.Google Scholar
  16. [16]
    W. Zhuo, T. Iida, J. Moriizumi, T. Aoyagi and I. Takahashi, Simulation of the concentrations and distributions of indoor radon and thoron, Radiat. Prot. Dosim., 93 (2001) 357–367.CrossRefGoogle Scholar
  17. [17]
    V. Urosevic, D. Nikezic and S. Vulovic, A theoretical approach to indoor radon and thoron distribution, J. Enviro. Radioact., 99 (2008) 1829–1833.CrossRefGoogle Scholar
  18. [18]
    L. Oufni and M.A. Misdaq, Radon emanation in a limestone cave using CR-39 and LR-115 solid state nuclear track detectors, J. Radio. Anal. Nucl. Chem., 250 (2001) 309–313.Google Scholar
  19. [19]
    L. Oufni, M.A. Misdaq, M. Amrane, Radon level and radon effective dose rate determination in Moroccan dwellings using SSNTDs, Rad. Meas., 40 (2005) 118–123.CrossRefGoogle Scholar
  20. [20]
    L. Oufni, Determination of the radon diffusion coefficient and radon exhalation rate in Moroccan quaternary samples using the SSNTD technique, J.Radio. Anal. Nucl. Chem, 256 (2003) 581–586.Google Scholar
  21. [21]
    L. Oufni, S. Taj, B. Manaut and M. Eddouks, Transfer of uranium and thorium from soil to different parts of medicinal plants using SSNTD, J. Radio. Anal. Nucl. Chem., 287 (2011) 403–410.CrossRefGoogle Scholar
  22. [22]
    G. de With and P. de Jong, CFD modelling of thoron and thoron progeny in the indoor environment, Radiat. Prot. Dosim., 145 (2011) 138–144.CrossRefGoogle Scholar
  23. [23]
    N. Chauhan, R.P. Chauhan, M. Joshi, T.K. Agarwal, P. Aggarwal and B.K.J. Sahoo, Study of indoor radon distribution using measurements and CFD modeling, Enviro. Radioact., 136 (2014) 105–111.CrossRefGoogle Scholar
  24. [24]
    K. Akbari, J. Mahmoudi and M. Ghanbari, Influence of indoor air conditions on radon concentration in a detached house, J. Enviro. Radioact., 116 (2013) 166–173.CrossRefGoogle Scholar
  25. [25]
    H. Elharfi, M. Naïmi, M. Lamsaadi, A. Raji and M. Hasnaoui, Inter. Schol. Res. Net., 2012 (2012) 16.Google Scholar
  26. [26]
    R. Rabi, L. Oufni,. A theoretical investigation of the distribution of indoor radon concentrations, Indian J. Phys., 91 (2017) 471–479.CrossRefADSGoogle Scholar
  27. [27]
    J.A. Rabi and A.A. Mohamad, Parametric modelling and numerical simulation of natural-convective transport of radon-222 from a phosphogypsum stack into open air, Appl. Math. Mod., 30 (2006) 1546–1560.CrossRefzbMATHGoogle Scholar
  28. [28]
    A. Kumar, R.P. Chauhan, J. Manish and B.K. Sahoo, Modeling of indoor radon concentration from radon exhalation rates of building materials and validation through measurements, J. Enviro. Radioact., 127 (2014) 50–55.CrossRefGoogle Scholar
  29. [29]
    J. Porestendorfer, Properties and behaviour of radon and thoron and their decay products in the air, J. Aerosol. Sci., 25 (1994) 219–263.CrossRefADSGoogle Scholar
  30. [30]
    UNSCEAR. United Nations Scientific Committee on the Effects of Atomic Radiation. Report to the General Assembly with Scientific Annexes. United Nations Publication, New York, USA, (2000).Google Scholar
  31. [31]
    (ICRP) (International Commission on Radiological Protection) (1993) Protection against radon at home and at work. ICRP Publication 65, Ann ICRP 23(2).Google Scholar

Copyright information

© Metrology Society of India 2017

Authors and Affiliations

  1. 1.Department of Physics (LPM), Faculty of Sciences and TechniquesSultan Moulay Sliman UniversityBeni-MellalMorocco

Personalised recommendations