International Journal of Radiation Research

en Gross beta activities and Beryllium-7 concentrations in surface air Radiation Biology Radiation Biology تحقيق بديع Original Research ABSTRACT Background: were made each week during year 2002 from samples of atmospheric aerosols filtered from theair at Tehran Nuclear Research Center.Measurement of gross beta activities and cosmogenic Beryllium-7 concentrationsMaterials and Methodssampler at the Nuclear Research Center meteorological station in Tehran (40contents of samples were determined with semiconductor gamma spectrometry. The long-livedbeta activity, i.e. total beta activity measured four days after the end of sampling (after decay of: The aerosol samples were collected weekly with high-volume airo 35. N). The 7Be220The long-lived beta activity consists mainly of amount of artificial radionuclides in the air is negligible.Rn progeny and short-lived 220Rn progeny), was assessed with an automatic beta analyzer.210Bi, the daughter nuclide of 210Pb, as theResults: lognormal distribution during the study period 2002. The arithmetic mean of annual concentrationsof The air concentrations of both the 7Be and the long-lived beta activity displayed a7Be and 210 Pb was 6.30 and 0.50 mBqm-3, respectively .Conclusion: beta activities are partially correlated. Both have maximum concentrations during warmmid-year months. Despite the different origins, the concentrations of both the 7Be and the long.livedIran. J. Radiat. Res., 2005 2 (4): 211-213 ,lead-210,gamma spectrometry,gross beta activity,Beryllium-7 concentrations 211 213 http://ijrr.com/browse.php?a_code=A-10-1-88&slc_lang=en&sid=1 F. Arkian arkian 1@yahoo.com 79003194753284600224 79003194753284600224 Yes J. Amidi 79003194753284600225 79003194753284600225 No