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      http://www.ias.ac.in/article/fulltext/jess/125/07/1391-1397

    • Keywords

       

      Radiation; natural trace gas; radon; ion-pair production

    • Abstract

       

      Analysis of one year measurements of in situ radon ($^{222}$Rn) and its progenies along with surface air temperature, relative humidity and pressure near to the Earth’s surface has been carried out for the first time at the National Atmospheric Research Laboratory (NARL, 13.5◦N and 79.2◦E) located in a rural site in Gadanki, south India. The dataset was analysed to understand the behaviour of radon inrelation to the surface air temperature and relative humidity at a rural site. It was observed that over a period of the 24 hours in a day, the activity of radon and its progenies reaches a peak in the morning hours followed by a remarkable decrease in the afternoon hours. Relatively, a higher concentration of radon was observed at NARL during fair weather days, and this can be attributed to the presence ofrocky hills and dense vegetation surrounding the site. The high negative correlation between surface air temperature and activity of radon (R = – 0.70, on an annual scale) suggests that dynamical removal of radon due to increased vertical mixing is one of the most important controlling processes of the radon accumulation in the atmospheric surface layer. The annual averaged activity of radon was found to be12.01±0.66 Bq m$^{−3}$ and 4.25±0.18 Bq m$^{−3}$ for its progenies, in the study period.

    • Author Affiliations

       

      K Charan Kumar1 T Rajendra Prasad2 M Venkat Ratnam2 Nagaraja Kamsali1

      1. Department of Physics, Bangalore University, Bengaluru 560 056, India.
      2. National Atmospheric Research Laboratory, Gadanki 517 112, India.
    • Dates

       
  • Journal of Earth System Science | News

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