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1.
Smoke Detectors
Purchasing smoke
detectors and installing and maintaining them properly is a good first step in prevention.
There are two basic types of
detectors: photoelectric alarms that are activated by smoke particles interrupting a beam of light within the device; and ionization types that contain a radioactive material such as americium-241 that ionizes the air in a small chamber thus creating a weak electric current.
http://www.fun-home-projects.com/home_ownership/safety_and_special_interest/smoke_detectors.html