An ionization type of detector forms anelectrical path inside a small chamber with a very small amount of radioactivematerial. When smoke enters the chamber, the particles attach themselves to theions and change the electrical current flow. A photoelectric type ofdetector works by using a photoelectric cell and a light source. The light doesnot usually reach the photoelectric cell, but when smoke is present the light isdispersed and reaches the photoelectric cell, triggering the alarm. The maindifference between the two types is photoelectric types are more sensitive tolarge particles and ionization types are more sensitive to small particles. Modern home design should include at least one of each type. Most of all, do not lifesaving convenience that allows you to speak keychain handy when there is a stranger in the door, in case you must contact for aid in an instant.
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