Understanding Discord NSFW Servers A Guide for Responsible Users.pdf
10/5 What are the three types of radioactive decay?
1. Launch:10/5
Grab a your binder and immediately take a seat
Read “Effects of Radiation” handout
Make a list of at least 5 different effects radiation
has on the human body
3. What are the 3 types
of radioactive decay?
Mr. Heffner
10/5/09
4. What is radioactive decay?
Radioactive decay is…
when unstable isotopes transform into more stable
isotopes by emitting particles from the nucleus.
atoms with an neutron inbalance
shooting out
5. What is radioactive decay?
There are three types of decay (a.k.a. radiation)
1. Alpha ( ) decay
2. Beta ( ) decay
3. Gamma ( ) decay
6. What is an alpha ( )
particle?
4
Symbol:
2
He
Description:
Basically, a Helium nucleus
2 protons, 2 neutrons
Atomic mass = 4 amu
Penetration:
Low, can’t even get through a sheet of paper
7. What is a beta ( ) particle?
0
Symbol:
-1
e
Description:
Basically, an electron
Neutron converts to a proton
Penetration:
Medium, can’t get through a sheet of metal
8. What is a gamma ( )
particle?
Symbol: 0
0
Description:
Basically, a high energy ray
a.k.a. X-rays
Penetration:
High, only stopped by thick wall of lead
Very dangerous: can penetrate skin DNA mutation
Three-eyed fish
10. Foldable
Review foldable by yourself (4 min)
MEMORIZE THE SYMBOLS AND DEFINITIONS!
Quiz your partner (4 min)
11. Practice Questions
1. What happens during radioactive decay?
2. Why does radioactive decay occur?
3. What are the 3 types of decay?
4. Draw the symbol for a(n)
1. particle
2. particle
3. particle
5. Which of the particles can penetrate a piece of
paper? A thin sheet of metal?
12. Exit Slip
1. When an unstable atom undergoes nuclear decay
a. it continues to absorb energy until stability is reached
b. it always changes the identity of the atom
c. it becomes a highly reactive isotope that forms chemical
bonds with other atoms
d. it emits , , and particles to become more stable
2. Which of the following is the correct symbol for a
particle?
a. 42He
b. 01e
c. 0-1e
d. 24He
13. Exit Slip
3. An -particle consists of
a. 2 protons, 2 neutrons, and has an atomic mass of 4
amu
b. a hydrogen-4 nucleus
c. 4 electrons and 2 protons
d. only electrons
4. Gamma ( ) rays are
a. high-energy particles that can penetrate skin and
and mutate DNA
b. less energetic than or particles
c. responsible for changing an atom into a different
element
d. not emitted during radioactive decay
14. Exit Slip
5. A 2-cm thick piece of cardboard placed over a
radiation source would be most effective in
protecting against which type of radiation?
a. alpha
b. beta
c. gamma
d. X-ray