NDLI: Thermal desorption gas chromatography and positron annihilation spectroscopy contribution to alpha decay studies in actinide-doped matrices

Content Provider	IEEE Xplore Digital Library
Author	Roudil, D. Jegou, C. Pik, R. Barthe, M.F. Cuney, M. Vella, F. Pipon, Y. Folch, B. Broudic, V.
Copyright Year	2009
Description	Author affiliation: Commissariat à l'Énergie Atomique at the Rhône Valley Research Center, 30200 Bagnols-sur-Cèze, France (Roudil, D.; Jegou, C.; Vella, F.; Folch, B.; Broudic, V.) \|\| CNRS - CEMHTI, 45071 Orléans, France (Barthe, M.F.) \|\| Université de Nancy, G2R, CNRS - CREGU, 54506 Vandoeuvre-lès-Nancy, France (Cuney, M.) \|\| IPNL CNRS, IN2P3 UMR 5822, 69622 Villeurbanne, France (Pipon, Y.) \|\| CNRS - CRPG, 54506 Vandoeuvre-lès-Nancy, France (Pik, R.)
Abstract	A thermal desorption system coupled with a gas analyzer has been adapted and nuclearized to investigate He behavior in actinide-doped samples used to simulate alpha decay aging. This technique widely used in standard laboratories allows measurements of the helium balance and reduced diffusion coefficients, and a preliminary evaluation of helium locations (related to defects and thermal annealing). In our system implemented in a hot cell, small samples are annealed at up to 1100° in controlled atmosphere. They are inserted in a 10 to 20 $cm^{3}$ vessel connected to a micro gas chromatography detector. Initial system calibration allowed concentration measurements within about 10%. Comparisons with the CNRS/CRPG rare gas analysis laboratory at Nancy, France, were applied on natural uranium oxides originating from Oklo (Gabon) and Mistamisk (Canada). The latest results obtained on Mistamisk samples are in good agreement, with a maximum relative deviation of 14%. The data were used to determine the activation energy of about 1 $eV·at^{−1}.$ On (U,Pu)O2 and PuO2 samples the experiments highlight the impact of defects (up to 100 dpa) on He mobility. The defect population must now be characterized to improve our knowledge of He/defect interactions and mechanisms. In addition and synergy to the macroscopic release measurements by gas chromatography, positron annihilation spectroscopy, an effective nondestructive technique for vacancy defect investigation, was also developed and nuclearized in our hot cell laboratory as part of a project supported by the NOMADE and MATINEX research groups. Specific protocols for doped sample analysis were also developed and validated with UO2 and (U,Pu)O2 samples.
Starting Page	1
Ending Page	6
File Size	468018
Page Count	6
File Format	PDF
ISBN	9781424452071
DOI	10.1109/ANIMMA.2009.5503695
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-07
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gas chromatography Spectroscopy Analytical models Annealing Atmospheric measurements Laboratories Nuclear radiation effects Positrons Aging Radioactive decay Helium Fuels
Content Type	Text
Resource Type	Article

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