Abstract
DOI:10.17014/ijog.2.1.35-42
Radon and thoron exhalation rate from soil is one of the most important factors that can influence the radioactivity level in the environment. Radon and thoron gases are produced by the decay of the radioactive elements those are radium and thorium in the soil, where its concentration depends on the soil conditions and the local geological background. In this paper, the results of radon and thoron exhalation rate measurements from surface soil of Bangka Belitung Islands at thirty six measurement sites are presented. Exhalation rates of radon and thoron were measured by using an accumulation chamber equipped with a solid-state alpha particle detector. Furthermore, the correlations between radon and thoron exhalation rates with their parent nuclide (226Ra and 232Th) concentrations in collected soil samples from the same locations were also evaluated. The result of the measurement shows that mostly the distribution of radon and thoron is similar to 226Ra and 232Th, eventhough it was not a good correlation between radon and thoron exhalation rate with their parent activity concentrations (226Ra and 232Th) due to the environmental factors that can influence the radon and thoron mobilities in the soil. In comparison to a world average, Bangka Belitung Islands have the 222Rn and 220Rn exhalation rates higher than the world average value for the regions with normal background radiation.
References
DURRIGE COMPANY INC., 2010. Reference Manual Version 6.0.1, RAD-7TM Electronic Radon Detector.
HASL-300, 1997. Radionuclide Data, EML Procedures Manual. 28th Edition I, U.S. Department of Energy, New York.
Hassan, N.M., Hosoda, M., Iwaoka, K., Sorimachi, A., Janik, M., Kranrod, Ch., Sahoo, S.K., ishikawa,T., Yonehara, H., Fukushi, M., Tokonami, S., 2011. Simultaneous Measurement of Radon and Thoron Released from Building Materials Used in Japan, Nuclear Science and Technology, 1, p.404-407.
Hosoda, M., Shimo, M., Sugino, M., Furukawa, M., and Fukushi, M., 2007. Effect of Soil Moisture Content on Radon and Thoron Exhalation, J. Nuclear Science and Technology, 44 (4), p.664–672. DOI:10.1080/18811248.2007.9711855
IAEA, 2011. Country Nuclear Power Profiles - 2011 Edition, Non serial publications, IAEACNPP/2011/CD, IAEA, VIENNA (ISBN:978-92-0-169710-3).
Knoll, G. F., 2000. Radiation Detection and Measurements, 3rd ed., Jhon Wiley & Sons, Inc., New York, p.65.
Mudd G.M., 2008. Radon sources and impacts: a review of mining and non-mining issues. Reviews in Environmental Science and Biotechnology, 7, 325–353. DOI:10.1007/s11157-008-9141-z
Porstendorfer, J., 1994. Properties and Behaviour of Radon and Thoron and their Decay Products in the Air, J. Aerosol Sci., 25 (2), p.219 – 263. DOI:10.1016/0021-8502(94)90077-9
Ramachandan, T.V. and Sathish, L.A., 2011. Nationwide indoor 222Rn and 220Rn map for India. Journal of Environmental Radioactivity,102, p.975-986. DOI:10.1016/j.jenvrad.2011.06.009
Rani, A. and Singh, S., 2005. Natural Radioactivity Levels in Soil Samples from Some Areas of Himachal Pradesh, India Using γ-Ray Spectrometry. Atmospheric Environment,39, p.6306 - 6314. DOI: 10.1016/j.atmosenv.2005.07.050
Schwartz, M. O., Rajah, S. S., Askury, A. K., Putthapiban, P., Djaswadi, S., 1995. The Sotheast Asian Tin Belt, Earth-Science, Reviews 38, p.95 – 293.
Syarbaini, Warsona, A., and Iskandar, D., 2014, Natural Radioactivity in Some Food Crops from Bangka-Belitung Islands, Indonesia, Atom Indonesia, 40 (1), p.27.
Saleh, A.M. and Ramli, A. T., 2013. Alajerami, Y., Assessment of Environmental 226Ra, 232Th and 40K Concentrations in the Region of Elevated Radiation Background in Segamat Distric, Johor, Malaysia. Journal of Environmental Radioactivity, 124,p.130 - 140. DOI:10.1016/j.jenvrad.2013.04.013
Sun, K., Guo, Q., and Zhuo, W, 2004. Feasibility for Mapping Radon Exhalation Rate from Soil in China, J. Nuclear Science and Technology, 41(1), p.86–90.
Tuccimei, P., Moroni, M., Norcia, D., 2006. Simultaneous determination of 222Rn and 220Rn exhalation rates from building materials used in Central Italy with accumulation chambers and a continuous solid state alpha detector: Influence of particle size, humidity and precursors concentration,” Appl. Radiat. Isot., 64, p.254.
Tuccimei, P., Moroni, M., Norcia, D., 2006. Simultaneous determination of 222Rn and 220Rn exhalation rates from building materials used in Central Italy with accumulation chambers and a continuous solid state alpha detector: Influence of particle size, humidity and precursors concentration,” Appl. Radiat. Isot., 64, p.254. DOI:10.1016/j.apradiso.2005.07.016
UNSCEAR, 2000. Sources and Effects of Ionizing Radiation, United Nations Scientific Committee on the Effects of Atomic Radiation, United Nations publication, New York.
WHO, 2009. Handbook on Indoor Radon a Public Health Perspective World Health Organization, WHO publication. DOI:10.1088/0952-4746/29/4/M01