Abstract
Detection of anthropogenic noble gas isotopes in the atmosphere is an important indication that a below ground nuclear-test has taken place. Diffusion plays a critical role in the transport of these gases through the geological media to the surface where they can be detected. Better techniques are need with which to study the diffusion of noble gases through porous systems. Here we demonstrate the suitability of using prompt gamma activation analysis to measure the time dependent concentration of argon as a result of its diffusion through a porous medium that is saturated with nitrogen at atmospheric pressure. The experiments were conducted in a 1 m long tube, 10 cm diameter, and packed with fine SiO2 sand. Prompt gamma activation analysis was used to measure the concentration of argon within the experimental system as a function of time.
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Acknowledgments
The authors would like to thank Dr. Carlos Hidrovo for discussions about diffusion of gases through porous media, and the staff of the Nuclear Engineering Teaching Laboratory for their help with the prompt gamma measurements. This material is based upon work supported by the Department of Energy, National Nuclear Security Administration under Award Number DE-AC52-09NA28608.
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Rios Perez, C.A., Biegalski, S. & Deinert, M.R. Measuring the diffusion of noble gases through a porous medium using prompt gamma activation analysis. J Radioanal Nucl Chem 296, 951–956 (2013). https://doi.org/10.1007/s10967-012-2003-8
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DOI: https://doi.org/10.1007/s10967-012-2003-8