Method of enhancing selective isotope desorption from metals

Title: Method of enhancing selective isotope desorption from metals

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Abstract

This invention relates generally to the field of gas desorption from metals; and, more particularly, to a method of enhancing the selective desorption of a particular isotope of a gas from metals. Enhanced selective desorption is especially useful in the operation of fusion devices.

Inventors:: Knize, R J; Cecchi, J L

Issue Date:: 1983-07-26

OSTI Identifier:: 6998277

Application Number:: ON: DE84011031

Assignee:: Dept. of Energy

DOE Contract Number:: AC02-76CH03073

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; GETTERS; HYDROGEN; DESORPTION; IMPURITIES; REMOVAL; THERMONUCLEAR REACTORS; ALUMINIUM ALLOYS; PATENTS; RECYCLING; ZIRCONIUM ALLOYS; ALLOYS; DOCUMENT TYPES; ELEMENTS; NONMETALS; 700206* - Fusion Power Plant Technology- Environmental Aspects

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                    Knize, R J, and Cecchi, J L. Method of enhancing selective isotope desorption from metals.  United States: N. p., 1983. 
        Web.

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                    Knize, R J, & Cecchi, J L. Method of enhancing selective isotope desorption from metals.  United States.

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                    Knize, R J, and Cecchi, J L. Tue .  
        "Method of enhancing selective isotope desorption from metals".  United States.

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@article{osti_6998277,

  title        = {Method of enhancing selective isotope desorption from metals},

  author       = {Knize, R J and Cecchi, J L},

  abstractNote = {This invention relates generally to the field of gas desorption from metals; and, more particularly, to a method of enhancing the selective desorption of a particular isotope of a gas from metals. Enhanced selective desorption is especially useful in the operation of fusion devices.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1983},

  month        = {7}

}

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Method of enhancing selective isotope desorption from metals

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A method of enhancing the thermal desorption of a first isotope of a diatomic gas from a metal comprises the steps of (a) establishing a partial pressure of a second isotope of the diatomic gas in vicinity of the metal; heating the metal to a temperature such that the first isotope is desorbed from the metal; and reducing the partial pressure of the desorbed first isotope while maintaining the partial pressure of the second isotope substantially constant. The method is especially useful for enhancing the desorption of tritium from the Zr-Al getter in a plasma confinement device.
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The thermal desorption of hydrogen isotopes from a metal is usually a second order process the rate for which becomes asymptotically slow. We present a method for enhancing the desorption rate of one particular isotope by maintaining a constant pressure of another molecular species. This results in an effective first order desorption and concommitant exponential decay of the concentration of the selected isotope. Data is presented for the enhanced desorption of deuterium from a Zr--Al getter. The results agree well with a theoretical model, which is discussed. This enhanced desorption method should be particularly useful for tritium operation in themore » tokamak fusion test reactor.« less
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The thermal desorption of hydrogen isotopes from a metal is usually a second order process, the rate for which becomes asymptotically slow. We present a method for enhancing the desorption rate of one particular isotope by maintaining a constant pressure of another molecular species. This results in an effective first order desorption and concomitant exponential decay of the concentration of the selected isotope. Data are presented for the enhanced desorption of deuterium from a Zr-Al getter. The results agree well with a theoretical model, which is discussed. This enhanced desorption method should be particularly useful for tritium operation in themore » Tokamak Fusion Test Reactor.« less
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