1. RADIATION

2. Radioisotopes unstable isotopes that emit radiation to become more stable

3. Radiation rays and particles emitted from a radioactive source

4. Three Types of radiation:
Alpha (a)
Beta (b)
Gamma (g)

5. Alpha Particle 2 protons and 2 neutronsor

6. Beta Particle a stream of high speed electronsor

7. Gamma Ray very energetic form of light (a ray, not a particle)

8. Level of Penetration

9. High, only thick metal slows it
Symbol
Charge
Penetration
Power a 2+
Low, paper stops it b 1-
Medium, clothes stop it g
None
High, only thick metal slows it

10. When an atom emits radiation (a, b, g) it is undergoing radioactive decay.

11. Half-Life the time it takes for ½ of a radioisotope to decay

12. The half-life of cesium-137 is 30 years
The half-life of cesium-137 is 30 years. If you start with a 20g sample, how much is left after 30 years?
10g !!!

13. After 60 years?
5g !!!
After 90 years?
2.5g !!!

14. Carbon-14 Dating

15. Other Uses of Radiation: cancer treatment smoke detectors imaging

16. Fission A large nucleus is split into two smaller nuclei (A-Bombs;
Nuclear Reactors)

18. Fusion Two small nuclei Join to form one large nucleus (H-Bombs;
The sun)