RADIOACTIVITY

RADIOACTIVITY

1. ALPHA PARTICLE

   • charge= +1

2. Helium nucleus

   • 2 protons, 2 neutrons
     • mass number = -4 atomic number= -2

3. -travels a few cm in the air

4. can be stopped by a piece of paper

5. BETA PARTICLE

   • charge= -1

6. nucleus = high energy electron

7. atomic no. INCREASES by 1, mass no. is UNCHANGED

8. fast moving

9. GAMMA RADIATION

   • short electromagnetic wave
     • no charge in atomic or mass
       • can be stopped by 2-3 meters of lead or concrete

10. Types of Radiation

11. Detection= a geiger counter, cloud chamber, photographic means

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