1. Electromagnetic Spectrum

4. Why do we fear radiation?

5. Radioactive atom

6. Radioactive atom
A material that spontaneously emits radiation —alpha particles, beta particles, and gamma rays

7.  +  

9. A helium atom
2 protons and
2 neutrons

11. An electron

13. Energy

15. Complete the following table
alpha
beta
gamma
few cm of air
sheet of paper
thin aluminium
human skin
reduced by thick concrete or lead
symbol
Can penetrate…… γ  

16. reduced by thick concrete or lead
Penetration
alpha
beta
gamma
few cm of air
sheet of paper
thin aluminium
human skin
reduced by thick concrete or lead
symbol
Can penetrate……  γ x  

17. Alpha
Beta
Gamma
Aluminium
Lead
Paper

18. Penetrating Power
Radiation
Structure
Size
Charge   