radioactivity

radioactivity

1. decay

   • alpha decay
     • particle
     • slow
     • low power
   • beta
     • particle
     • faster
     • medium power
   • gamma
     • ray
     • high power
     • speed of light

2. scientists involved

   • marie curie
     • discovered elements
       • polonium
       • radium
   • henri becquerel
     • discovered radioactive decay

3. uses

   • smoke alarms
     • americium 241
   • power
     • thorium
     • uranium
     • polonium

4. half life

   • how long it takes to for half of the material
     • francium
       • 22 minutes
     • americium
       • 140 years