Sequential isotopic determination of plutonium,thorium, americium and uranium in the air filter and drinking water samples around the WIPP site |
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Authors: | P Thakur S Ballard J L Conca |
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Institution: | (1) Carlsbad Environmental Monitoring and Research Center, 1400 University Drive, Carlsbad, NM 88220, USA |
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Abstract: | The simultaneous determination of actinides in air filter and water samples around the WIPP site have been demonstrated. The
analytical method is based on the selective separation and purification by anion exchange and Eichrome-TEVA, TRU and DGA-resin
followed by determination of actinides by alpha spectrometry. Counting sources for alpha spectrometric measurements were prepared
by microcoprecipitation on neodymium fluoride (NdF3). Radiochemical yields were determined using 242Pu, 229Th, 243Am and 232U as tracers. The validation of the method is performed through the analysis of reference materials or participating in laboratory
intercomparison programs. The plutonium concentrations in aerosols varied seasonally, being highest in spring and summer due
to the spring-time enhanced wind-storm transportation of radioactive aerosols from the stratosphere to the troposphere. The
238Pu/239+240Pu activity ratio in the aerosol samples is typically close to that of global fallout from historic above-ground nuclear weapons
testing. The results presented here indicate that the source of plutonium in the WIPP environment results mainly from global
nuclear fallout and there is no evidence of increases in radiological contaminants in the region that could be attributed
to releases from the WIPP. |
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