Seasonal variations of atmospheric210Pb and7Be concentrations at Kumamoto, Japan and their
removal from the atmosphere as wet and dry depositions</p>
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| Authors: | N Momoshima S Nishio Y Kusano A Fukuda A Ishimoto |
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| Institution: | (1) CRC HAS Institute of Isotopes, P.O. Box 77, H-1525 Budapest, Hungary;(2) CRC HAS Institute of Isotopes, P.O. Box 77, H-1525 Budapest, Hungary;(3) SSNS Institute for Expert Services, Budapest 62, P.O. Box: 710/3, H-1399 Budapest Hungary;(4) SSNS Institute for Expert Services, Budapest 62, P.O. Box: 710/3, H-1399 Budapest Hungary;(5) NPP Paks, P.O. Box 71, H-7031, Paks, Hungary;(6) NPP Paks, P.O. Box 71, H-7031, Paks, Hungary;(7) Miklós Zrínyi National Defence University, Budapest 146, P.O. Box 15, H-1581, Budapest, Hungary;(8) Miklós Zrínyi National Defence University, Budapest 146, P.O. Box 15, H-1581, Budapest, Hungary |
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| Abstract: | Summary A relatively simple chemical separation procedure has been developed for the simultaneous determination of89Sr and 9 0Sractivities in water samples and on aerosol-filters of the Nuclear Power Plant (NPP) Paks origin. The procedure combines
the cation-exchange chromatographic (Dowex 50 WX 8 resin) and solid phase extraction (EIChroM Sr.Spec?, DC18C6 crown ether)
steps. The beta-radiation of radionuclides can be measured directly after the chemical separation by LSC. The activities of89Sr,90Sr and90Y are calculated from an over determined set of equations using a method of constrained optimization technique. The equations
are based on LSC measurements performed in three counting windows plus the90Sr-90Y decay law. The chemical yield of strontium is determined by ICP-AES. The lowest limits of detectable activity, for the measurement
time of 600 minutes, are 30 mBq/sample and 18 mBq/sample for89Sr and90Sr, respectively. |
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