Title: Source Term Identification of Environmental Radioactive Pu/U Particles by their Characterisation with Non-Destructive Analytical Techniques
Authors: ERIKSSON MatsOSAN JanosJERNSTROEM JussiWEGRZYNEK D.SIMON R.CHINEA-CANO E.MARKOWICZ A.BAMFORD S.TAMBORINI GABRIELETOEROEK S.FALKENBERG G.ALSECZ A.DAAHLGARD H.WOBRAUSCHEK P.STRELI C.ZOEGER N.BETTI MARIA
Citation: SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY vol. 60 p. 455-469
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2005
JRC N°: JRC30459
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC30459
Type: Articles in Journals
Abstract: Six radioactive particles stemming from Thule area (NW-Greenland) were investigated by gamma-ray and L X-ray spectrometry based on radioactive disintegration, scanning electron microscopy coupled with energy-dispersive and wavelength-dispersive X-ray spectrometer, synchrotron radiation based techniques as microscopic X-ray fluorescence, microscopic X-ray absorption near-edge structure (A-XANES) as well as combined X-ray absorption and fluorescence microtomography. Additionally, one particle from Mururoa atoll was examined by microtomography. From the results obtained, it was found out that the U and Pu were mixed in the particles. The U:Pu intensity ratios in the Thule particles varied between 0.05 and 0.36. The results from the microtomography showed that U:Pu ratio was not homogeneously distributed. The 241Am:238 239 240Pu activity ratios varied between 0.13 and 0.17, indicating that the particles originate from different source terms. The oxidation states of U and Pu as determined by A-XANES showed that U(IV) is the preponderant species and for Pu, two types of particles could be evidenced. One set had about 90 Pu(IV) while in the other the ratio Pu(IV):Pu(VI) was about one third.
JRC Institute:Institute for Transuranium Elements

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