Radiation Revision

1. The use of radiation to treat cancer by killing cancerous cells.
4. A substance that gives off alpha radiation.
5. Energy produced from splitting atomic nuclei in reactors.
7. When radioactive materials are accidentally spread to other objects or people.
8. The process where radiation causes an atom to gain or lose electrons.
9. Gamma radiation is a high-energy electromagnetic wave.
11. A small, fast-moving particle with a negative charge from a radioactive nucleus.
13. A measurement of exposure to ionizing radiation.
14. The process by which an unstable nucleus changes to become more stable.
16. The splitting of a large atomic nucleus into smaller nuclei, releasing energy.
17. Alpha radiation consists of two protons and two neutrons.
19. The process of combining smaller nuclei to form a larger nucleus, releasing energy.
20. The process by which unstable atomic nuclei emit radiation.
21. The time it takes for half the nuclei in a radioactive substance to decay.

2. Radioactive substances used to follow the movement of materials in the body or environment.
3. Beta radiation is a high-speed electron emitted from a nucleus.
6. A form of energy transfer, including gamma radiation, that travels as waves.
10. Atoms of the same element with different numbers of neutrons.
11. The low-level radiation present all around us from natural and artificial sources.
12. A device used to measure or detect radiation levels.
15. The part of an atom that emits radiation to become more stable.
18. Exposing an object to radiation without making it radioactive.