Column I
1. decay
2. alpha decay
3. alpha particle
4. helium atom
5. beta decay
6. beta particle
7. neutron
8. gamma rays
9. Geiger counter
10. tracers
11. gamma decay
_____a. formed when an alpha particle picks up two electrons
______b. takes place when a nucleus shoots out an electron
______c. contains a proton and an electron, loses the electron
and becomes a proton
______d. any change in a nucleus that causes radioactivity
______e. takes place when a nucleus gives off high-energy rays
______f. instrument used to detect radioactivity
______g. a form of energy given off by a nucleus
______h. radioactive atoms that can be followed through the
steps of a chemical reaction
______i. an electron from the nucleus
______j. a particle made up of two protons and two neutrons
______k. takes place when a nucleus shoots out an alpha particle
12. Unscramble the following uses of radioactive tracers
a. Diseases of the thyroid gland can be treated with DONIEI _______________.
b. Agricultural scientists use tracers to study ALPTN ___________ growth.
c. Tracers show the effects of MELICHACS ______________ and ZIFIRTERELS
____________ on crops.
d. Tracers help diagnose DALICEM ____________ problems.
e. Radioactivity is used against NACREC _____________.
13. If there are 128 million atoms of a radioactive substance that has a half life of 3 minutes, how many of these atoms will remain radioactive after:
a. 3 min ___________________
b. 6 min ___________________
c. 9 min ___________________
d. 12 min ___________________
e. 15 min ____________________
f. 18 min ____________________
g. 21 min _____________________
14. How many atoms of that substance decayed after:
a. one half-life _____________________
b. two half-lives ______________________
c. three half-lives _______________________
d. four half-lives _______________________
e. five half-lives ________________________
f. six half-lives ________________________
g. seven half-lives ________________________
15. Define Half-Life: _____________________________________________________________
________________________________________________________________________________
16. Define fission: _______________________________________________________________
_________________________________________________________________________________
17. Define fusion: _________________________________________________________________
__________________________________________________________________________________