Device and method for detecting alkali metals

Details Device and method for detecting alkali metals Device and method for detecting alkali metals

G - Physics

01

N

324/23

G01N 27/66 (2006.01) G01N 27/62 (2006.01)

Patent

CA 1147810

RD 10,960 ABSTRACT OF THE DISCLOSURE A device for detecting alkali metals in gas streams includes a conduit defining a gas-flow cavity. A metalliferous filament having a work function of at least 5.3 ev is located within the cavity and extends transversely through the gas flow path a low-voltage source connected to the filament to a temperature sufficient to ionize the alkali metals being detected. An electrically conductive ion-collection member surrounds the filament to define an ionization-collection region. A high- voltage source develops an electrical field within the region, thereby effecting neutralization of metal ions attracted to and contacting the ion-collection member. An ammeter indicates a current proportional to the rate of ion neutralization.

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