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Smoke alarms can cut your chances of dying in an electrical or other house fire roughly in half. Yet our tests show that neither of the two major alarm types--ionization and photoelectric--provides complete protection. And even the few available hybrid models, which comprise both fire-sensing technologies, aren't ideal for all homes.
Ionization alarms ($10 and up), the most common, use a harmless amount of radioactive material to sniff out fire. They tend to react quickly to fast-flaming fires, like paper fires and those fed by flammable fluids. But they can be far slower to detect the smoky, slow-starting bedding and upholstery fires that often kill sleepers. ...