R. Belanger, D. W. Buckley, and J. B. Swenson, "Environmental Assessment of Ionization Chamber Smoke Detectors Containing Am-241," U.S. Photoelectric-kind smoke detectors detect smoke using an optical sensor, whereas ionization-type smoke detectors use an ionization chamber containing radioactive materials (see Fig. 1). These two applied sciences are finest utilized in tandem, since they're delicate to different-sized smoke particles. This is one of their advantages over photoelectric-type detectors, nevertheless it also results in more false alarms.

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The operation of a Bayard-Alpert gauge relies on the ionization of residual gasoline molecules by a continuing stream of electrons. A cold lure and a cryo trap are a must, and a gauge able to measuring down to this vary (e.