Activity concentrations of 226Ra, 228Ra, 210Pb, 40K and 7Be and their temporal variations in surface air |
| |
| Institution: | 1. NRC “Kurchatov Institute”, Institute of Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117218, Moscow, Russian Federation;2. Joint Institute for Nuclear Research, 141980, Dubna, Moscow region, Russian Federation;3. Institute of Experimental and Applied Physics, Czech Technical University in Prague, 12800, Prague, Czech Republic;4. Laboratoire Souterrain de Modane, F-73500, Modane, France;1. Norwegian Radiation Protection Authority, Department of Emergency Preparedness and Environmental Radioactivity, Grini næringspark 13 Postbox 55, NO-1332, Østerås, Norway;2. Norwegian Meteorological Institute, P.O. Box 43, Blindern, NO-0313, Oslo, Norway;1. Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China;2. Laboratory for Extreme Conditions Matter Properties, South West University of Science and Technology, Mianyang 621010, Sichuan, China;3. Department of Geology and Environmental Earth Science, Miami University, Oxford, OH 45056, USA;1. Dipartimento di Fisica, Università di Milano-Bicocca, Milano I-20126 - Italy;2. INFN - Sezione di Milano Bicocca, Milano I-20126 - Italy;3. Department of Physics and Astronomy, University of South Carolina, Columbia, SC 29208 - USA;4. INFN - Laboratori Nazionali di Legnaro, Legnaro (Padova) I-35020 - Italy;5. INFN - Laboratori Nazionali del Gran Sasso, Assergi (L''Aquila) I-67010 - Italy;6. Department of Physics, University of California, Berkeley, CA 94720 - USA;7. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 - USA;8. INFN - Sezione di Bologna, Bologna I-40127 - Italy;9. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 - USA;10. Dipartimento di Fisica, Sapienza Università di Roma, Roma I-00185 - Italy;11. INFN - Sezione di Roma, Roma I-00185 - Italy;12. Dipartimento di Fisica, Università di Genova, Genova I-16146 - Italy;13. INFN - Sezione di Genova, Genova I-16146 - Italy;14. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800 - China;15. Department of Physics, Yale University, New Haven, CT 06520 - USA;p. Department of Physics, University of Wisconsin, Madison, WI 53706 - USA;q. INFN - Laboratori Nazionali di Frascati, Frascati (Roma) I-00044 - Italy;r. Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, 91405 Orsay Campus - France;s. Physics Department, California Polytechnic State University, San Luis Obispo, CA 93407 - USA;t. Department of Materials Science and Engineering, University of California, Berkeley, CA 94720 - USA;u. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 - USA;v. Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 - USA;w. Laboratorio de Fisica Nuclear y Astroparticulas, Universidad de Zaragoza, Zaragoza 50009 - Spain;x. Service de Physique des Particules, CEA/Saclay, 91191 Gif-sur-Yvette - France;y. Lawrence Livermore National Laboratory, Livermore, CA 94550 - USA;z. Department of Nuclear Engineering, University of California, Berkeley, CA 94720 - USA;11. INFN - Sezione di Padova, Padova I-35131 - Italy;12. Dipartimento di Fisica, Università di Firenze, Firenze I-50125 - Italy;13. INFN - Sezione di Firenze, Firenze I-50125 - Italy;14. SUPA, Institute for Astronomy, University of Edimburgh, Blackford Hill, Edinburgh EH93HJ - UK;15. Dipartimento di Fisica, Università di Bologna, Bologna I-40127 - Italy |
| |
| Abstract: | Activity concentrations of the long-lived natural radionuclides 226Ra, 228Ra, 210Pb, 40K and of 7Be in surface air were measured twice monthly at a semi-rural location 10 km north of Munich (FRG) for at least three years. For the time interval 1983–1985, all values were found to be distributed log-normally, with geometric means (in μBq m−3) of 1·2 for 226Ra, 0·5 for 228Ra, 580 for 210Pb, 12 for 40K and 3500 for 7Be. Reflecting their common origin, the activity concentrations of 226Ra and 40K are correlated with surface air dust concentrations (geometric mean 59 μg m−3). Seasonal variations of 210Pb and 7Be air activity concentrations are established for the time interval 1978–1985.The contribution of local soil activity to the air activity concentrations of these radionuclides and of natural uranium is discussed. Resuspension factors are found to be of the order of 10−9m−1. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
