Answer :
Final answer:
A Fire-gas detector is an alarm-initiating device activated in the presence of gases such as carbon dioxide and monoxide, commonly produced by fires in confined spaces. Other types of detectors, like a Geiger counter or ionization-type smoke detectors, are not suitable for detecting these gases.
Explanation:
The type of alarm-initiating device that is activated in the presence of carbon dioxide, carbon monoxide, and other gases produced by fires in confined spaces is a Fire-gas detector. These detectors, such as carbon monoxide detectors, work by identifying the presence of gases that are commonly produced by fires. These detectors have saved numerous lives by alerting individuals to the build-up of dangerous gases.
Alternatively, another type of detector, the Geiger counter, is commonly used to detect the presence of ionizing radiation. It works by using a conducting cylinder filled with an insulating gas to detect changes in electric current that occur when radiation passes through. Although Geiger counters do a good job of indicating the relative intensity of ionizing radiation, they are not suitable for detecting the presence of gases produced by fires in confined spaces.
Lastly, there are detectors like the ionization-type smoke detector, which uses Americium-241, an alpha emitter, to ionize the air between two electrodes in the detector’s ionizing chamber. However, this type of detector is triggered by smoke particles, not gases.
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