Why does a smoke detector have radioactive material inside it?

Subject: Why does a smoke detector have radioactive material inside it?

Date: Sun Nov 12 02:40:19 2000
Posted by Jaimie
Grade level: 7-9 School: Wallington County Grammar School
City: Surrey State/Province: No state entered. Country: England
Area of science: Physics
ID: 974014819.Ph

Message:

If you take off a lid to a smoke detector there is a small mtal container with a "danger, Radioactive" sign on it. Why is this, and is it dangerous to humans?

Re: Why does a smoke detector have radioactive material inside it?

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