Smoke detector ionisation chamber using nickel-63 source

摘要

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.