1. Ch Radiation

2. Brain storm
With your elbow partner come up with any 5 facts, information or events that come to mind when you hear the term “Radioactivity”

3. What is Radiation?
What is radioactivitity 3 min

4. Radioisotopes Elements larger than AN 83
Examples: Uranium, Plutonium….
Have unstable nuclei that breaks apart releasing radiation

5. What is Radiation?
High rays of energy that can go through solid objects and cause damage

6. Alpha Beta 2 Classes of Radiation 1.Particle Rad. Gamma
2. Electromagnetic Waves
1.Particle Rad.
High speed element fragments
Alpha
Beta
Rays of energy
Gamma

7. Evaluating the danger….
1. What blocks/protects you from the radiation? 2. Rate the penetrating power?

8. Which radiation is most dangerous?
look for yourself....

9. Discuss this with your elbow partner
Why do most materials block alpha, beta but not gamma radiation?

10. Warm-up
Go to your Cornell Notes (11). Look at the 3 questions you wrote in the Cornell space 1. Person a) asks the first Cornell question and Person b) answers it 2. Reverse roles: Person b) asks the question- don’t worry if you have the same question- answer them again! Do 3 times until done

11. Alpha (α) Particle Radiation
Helium nucleus: 42He
Rutherford’s gold foil experiment

12. Writing α Decay Rx MN: 272 → 268 + 4 = 272 √ AN: 92 → 90 + 2 = 92 √
92272U _?_ He
92272U Th He
Law of Conservation of Mass!
MN: → = 272 √
AN: → = 92 √

13. Practice α decay…. Neptunium-195 MN: 195 → 191 + 4 = 195 √
93195Np → Pa He
MN: → = 195 √
AN: → = 93 √

14. Beta (β) Particle Radiation
A beta particle is a fast-moving electron
Beta particle: o-1e

15. 92270U β _?_ + o-1e 92270U β 27093 Np + o-1e Writing β Decay Rx
Law of Conservation of Mass!
MN: → = 270 √
AN: → = 92 √

16. 93195Np → 19594 Pu + o-1e Practice beta decay Neptunium-195
MN: → = 195 √
AN: → = 93 √

17. HW
Alpha and beta decay for
Th-230
Pa-258
Plutonium-243

18. Gamma Radiation
Gamma rays are high energy electromagnetic photons (similar to light rays, X-ray, UV)
Have not mass, no Rx writing!
Radioactive decay often produces alpha, beta and gamma radiation simultaneously!!!

19. Electromagnetic Spectrum

20. Reflection With a highlighter underline all new keywords
Write 4 questions in the Cornel Space
Make a Venn Diagram for alpha/beta and gamma radiation
Write alpha and beta decay for Uranium-255