First Alert Smoke Detectors How Safe Are Ionization Smoke Fire Alarm Detectors?

How safe are ionization smoke fire alarm detectors? - first alert smoke detectors

Hello,
In my large room containing about 7 years, I've a detector smoke was generated from the first warning - ionization detectors, a small radio active metal that is used for early detection - theres no batteries, and not for years because I have a fire alarm is the optical detector is only 1.5 million Abot me and asked me if I lose,

Any help would be gr8!