Smoke detector ionisation chamber using nickel-63 source

Details Smoke detector ionisation chamber using nickel-63 source Smoke detector ionisation chamber using nickel-63 source

1979-08-27

1982-06-22

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

G01T 118

Patent

active

043364543

ABSTRACT:
A smoke sensing detector of the dual ionisation region type, including an inner electrode, an outer electrode, and a collector electrode mounted on the inner electrode by means of pillers of insulating material, a first ionisation region being formed by the outer electrode and the collector electrode, and a second or reference ionisation region being formed by the inner electrode and the collector electrode, wherein the collector electrode supports or incorporates a nickel-63 radioactive source emitting radiation into both ionisation regions.

REFERENCES:
patent: 3676681 (1972-07-01), Kobayashi
patent: 3909815 (1975-09-01), Gacogne
patent: 4007374 (1977-02-01), Solomon
patent: 4017733 (1977-04-01), Ishll et al.
patent: 4021671 (1977-05-01), Solomon
patent: 4121105 (1978-10-01), Solomon

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