From: "Robert L. Bass" 
Newsgroups: misc.consumers.house alt.security.alarms alt.home.repair
Subject: Re: smoke detector chirps every 4 minutes
Date: Wed, 3 Sep 2003 13:41:31 -0400

> The half life of Americium 241 (the radioisotope used in
> smoke detectors) is 458 years so usually that would not
> be the issue. Typically smoke detectors act up because
> they are dirty and if battery powered the battery is low.

You are correct except that the half-life is a mere 432 years.  By then even
a free ADT system will have been paid off.  :^)

Regards,
Robert

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