نقش تهویه طبیعی بر کاهش غلظت رادون داخل ساختمان ها

نویسندگان

دانشگاه حکیم سبزواری

10.22052/6.4.1

چکیده

با توجه به گسترش روزافزون استفاده از سیستم ­های تهویه بسته در ساختمان­ ها، خطر افزایش غلظت رادون در داخل ساختمان­ ها روز به روز در حال افزایش است. در این پژوهش با انتخاب دو اتاق بسته نمونه، با محاسبه ضریب انتشار رادون از سطوح مختلف، تراکم رادون را در حالتی که راه­های تهویه طبیعی نیز کاملاً بسته شده بود، اندازه ­گیری کرده و با نتایج تحلیلی مقایسه گردید. نتایج به­ دست آمده به روشنی تفاوت تراکم این گاز را در سطوح مختلف نشان می­دهد؛ سپس با بازگذاشتن شکاف­ های معمول در ورودی این اتاق­ها، میزان تهویه طبیعی ناشی از تفاوت دمایی بین اتاق بسته با فضای بیرونی را به ­دست آورده و با جایگذاری آن­ها در معادلات تحلیلی، میزان تراکم رادون پس از تهویه محاسبه گردید. نتایج به ­دست آمده با نتایج تجربی از تطابق بسیار خوبی برخوردار است و نقش مهم تهویه طبیعی به­منظور کاهش تراکم رادون در محیط­ های سربسته حتی تا بیش از90% را نشان می­دهد

کلیدواژه‌ها


عنوان مقاله [English]

The role of natural ventilation on reducing indoor radon concentration

نویسندگان [English]

  • Seyed Mohamaad Zabihinpour
  • Aliasghar Mowlavi
  • Behnam Azadegan
چکیده [English]

Due to the increasing of closed ventilation systems used in buildings, the risk of indoor radon is increased day by day. In this study, we selected two sample rooms to calculate the radon emission coefficient from different levels, radon concentration measured when the natural ventilation was completely closed and compared with the analytical results. The results clearly show the difference in the amount of radon concentration at different levels; then, by overcoming the common gaps in the entrance of the rooms, the natural ventilation caused by the temperature difference between the room and the outside is obtained. By substituting them in the analytical equations, the radon concentration is calculated with ventilation. The calculated results are in good agreement with the experimental results and show the important role of natural ventilation to reduce indoor radon even to over 90%.
 

کلیدواژه‌ها [English]

  • Radon concentration measurements
  • natural ventilation
  • Emission tracks
  • Analytical methods
[1] UNSCEAR, Sources, Effects and Risks of Ionization Radiation, Report to the General Assembly, United Nations, New York, (2000). [2] R. Edelstein and J. William. Radon's deadly daughters: science, environmental policy, and the politics of risk. Rowman & Littlefield, (1998) 36–39. [3] J.M. Samet. Indoor radon and lung cancer. Estimating the risks. The Western journal of medicine. 156 (1992) 9–25. [4] L. Oufni and M.A, Misdaq. Radon emanation in a limestone cave using CR-39 and LR-115 solid state nuclear track detectors. J. Radioanal. Nucl. Chem. 250 (2001) 309–313. [5] K. Singh, M. Singh, S. Singh, H.S. Sahota and Z. Papp. Variation of radon (222Rn) progeny concentrations in outdoor air as a function of time, temperature and relative humidity. J. Environ. Radioact. 39 (2005) 213–217. [6] V.R.K. Murty, J.G. King, N. Karunakara and V.C.C. Raju. Indoor and outdoor radon levels and its diurnal variations in Botswana. Nucl. Instrum. Methods Phys. Res. 619 (2010) 446–448. [7] X. Dong, M. Liao, H. Wang and K.J. Kearfott. A study of diurnal and short-term variations of indoor radon concentrations at the University of Michigan, USA and their correlations with environmental factors. Indoor Built Environ. 0 (2016) 1–11. [8] N. Chauhan, R.P. Chauhan, M. Joshi, T.K. Agarwal, P. Aggarwal and B.K. Sahoo. Study of indoor radon distribution using measurements and CFD modeling. J.Environ. Radioact. 136 (2014) 105–111 [9] K. Akbari and R. Oman. Impacts of heat recovery ventilators on energy savings and indoor radon level. Management of Environmental Quality. 24 (2013) 682–694 [10] J.E. Lee, H.C. Park, H.S. Choi, S.Y. Cho, T.Y. Jeong and S.C. Roh. A numerical study on the performance evaluation of ventilation systems for indoor radon reduction. Korean J. Chem. Eng. 33 (2016) 782–794. [11] R. Rabi and L. Oufni. Study of radon dispersion in typical dwelling using CFD modeling combined with passive-active measurements. Radiation Physics and Chemistry. 137 (2017) 40–48. [16] B. Clavensjö and G. Åkerblom. The Radon Book. Stockholm: The Swedish Council for Building Research, (1994). [17] N.P. Petropoulos and S.E. Simopoulos. Building materials radon exhalation rate. The Science of the Total Environment, 272 (2001) 109–118.