Radioactivity Puzzle
Across
3. _____________ decay is where a nucleus loses two protons and two neutrons.
5. Charged particles or energy emitted by an unstable nucleus.
8. Our body tissues are normally protected from most background radiation by our outer ______.
11. The process by which an unstable nucleus emits one or more particles or energy in the form of electromagnetic radiation.
13. Alpha particles need a minimun of a thin sheet of ___________to block them.
16. A radioactive material added to a substance so that the substance's location can be detected later.
18. Nuclei with too many or too few neutrons are ________.
19. Beta particles need a minimum of a thin sheet of ______ such as a 1 cm thick piece of aluminum to block their radiation.
21. Gamma rays are a form of short wave, electromagnetic _______.
23. The process of the production of lighter nuclei from heavier nuclei (splitting the nuclei) is called _________.
Down
1. The interactions that binds protons and neutrons together in a nucleus.
2. Beta particles are negatively charged ________.
4. Radioactive materials have unstable ______.
6. Nuclear _______ refers to charged particles or energy emitted by an unstable nucleus.
7. The time required for half of a sample of radioactive nuclei to decay.
9. The process of nuclear change in an atom of radioactive material is called ______ decay.
10. Nuclear radiation that arises naturally from cosmic rays and from radioactive isotopes in the soil and air.
12. The process in which light nuclei combine at extremely high temperatures, forming heavier nuclei and releasing energy. Occurs naturally on stars.
13. Alpha particles do not have any electrons and are __________ charged.
14. A series of fission processes in which the neutrons emitted by a dividing nucleus cause the division of other nuclei.
15. Gamma rays requires a thick sheet of metal such as lead or a thick sheet of ________ to stop it.
17. In radioactive decay, with each successive half-life, half the remaining sample decays to form another_________.
20. Alpha particles are ________ nuclei with two protons and two neutrons.
22. Alpha, beta, and ______ are all types of radiation