C+Smoke+Detectors

=__Isotope and Radioactivity__= = = =Name of radioactive isotope/electromagnetic radiation/scientist:= = = = = =Explanation of interesting facts: (how used/works.experiments/discoveries)=
 * 1) Smoke detectors work either by physical process (ionization) or optical detection (photoelectric).
 * 2) Most smoke detectors are usual powered by a central fire alarm system.
 * 3) In the U.S., a civilian dies from a fire every 156 seconds.
 * 4) The smoke detector was invented in 1890 by Francis Robbins Upton.
 * 5) At the end of ten years, a smoke detector has gone through over 3.5 billion monitoring cycles.

=3 Advantages of using the radioactive isotope/radiation/benefits of discovery=

1. Lets you know when there is a fire.

2. Save money on insurance.

3. Has a fancy red light that keeps flashing. ;)

=3 Disadvantages of using the radioactive isotope/radiation/discovery:= 1. Takes some money to keep updated.

2. You can get woken up in the middle of the night.

3.

=Is the radioactive isotope/radiation/discovery still used today? Explain= Yes because people still need/want to know if there is going to be a fire.

=References=

=Diagram/image (include source and caption)= Type in the content of your page here.