Low-energy degassing mechanisms for a fluid-based radioxenon detection system

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Description

A method to concentrate heavy noble gases from the atmosphere using certain organic fluids is being developed. To use this technique in a system to monitor the atmosphere for important noble gas fission products (Xe-131, Xe-131m, Xe-133, Xe-133m, and Xe-135) generated by nuclear testing, the radionuclides captured in the fluid must either be detected in the fluid or degassed. This study presents experimental results for a number of possible degassing methods, including heating bubbling with a purge gas, ultrasonic agitation, vacuum, and combinations thereof. Methods were evaluated for energy and time requirements and dilution of the degas product. Initial experiments ... continued below

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9 p.

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Russ, W.R.; Stuenkel, D.O.; Valentine, J.D. & Gross, K.C. September 1, 1998.

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Description

A method to concentrate heavy noble gases from the atmosphere using certain organic fluids is being developed. To use this technique in a system to monitor the atmosphere for important noble gas fission products (Xe-131, Xe-131m, Xe-133, Xe-133m, and Xe-135) generated by nuclear testing, the radionuclides captured in the fluid must either be detected in the fluid or degassed. This study presents experimental results for a number of possible degassing methods, including heating bubbling with a purge gas, ultrasonic agitation, vacuum, and combinations thereof. Methods were evaluated for energy and time requirements and dilution of the degas product. Initial experiments indicate that in addition to overcoming the standard desorption process dictated by partial pressures per Henry`s Law, a capture mechanism must also be overcome to degas. Some type of agitation, thermal or mechanical, can be used to release weakly trapped gas atoms from the fluid, while diffusional mass transfer can be enhanced through entrainment with a purge gas or use of a vacuum. Ultrasonic agitation of a thin film in a strong vacuum has been shown to be the most effective method of those tested. Implementation of an efficient degas system, along with an absorption system and radioxenon detector could result in an ultrasensitive fluid-based radioxenon measurement system that is more portable, less expensive, and simpler than charcoal-based systems which use cryogenic techniques.

Physical Description

9 p.

Notes

OSTI as DE98058389

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  • 20. annual seismic research symposium on monitoring a comprehensive test ban treaty, Santa Fe, NM (United States), 21-23 Sep 1998

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  • Other: DE98058389
  • Report No.: ANL/RA/CP--96696
  • Report No.: CONF-980920--
  • Grant Number: W-31109-ENG-38;FG07-97ER62521
  • DOI: 10.2172/290811 | External Link
  • Office of Scientific & Technical Information Report Number: 290811
  • Archival Resource Key: ark:/67531/metadc679367

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 1, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 16, 2016, 4:56 p.m.

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Russ, W.R.; Stuenkel, D.O.; Valentine, J.D. & Gross, K.C. Low-energy degassing mechanisms for a fluid-based radioxenon detection system, report, September 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc679367/: accessed November 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.