RADIOACTIVITY
DIRECTIONS: In the blank space at the right of each definition, write the name of the term defined.
1. The property of substances that give off invisible rays that affect an unexposed photographic plate in the same way as light.
2. A device used to detect radiation by the ionization of low-pressure gas in a tube.
3. The glow that radium compounds produce when mixed with certain compounds like zinc sulfide.
4. The length of time required for the decay of one half of a given number of atoms of a radioactive nuclide.
5. Helium nucleus emitted from the nucleus of a radioactive nuclide.
6. Electron emitted from the nucleus of a radioactive nuclide.
7. High-energy electromagnetic waves emitted from the nucleus of a radioactive nuclide.
8. The heaviest nuclide of a series of related radioactive nuclides.
9. A reaction in which the nucleus of an atom undergoes a change in the number of protons, and consequently in its identity.
10. The difference between the measured mass of a nucleus and the sum of the masses of its constituent particles.
11. The energy released when a nucleus is formed from its component particles .
12. The emission of an alpha particle or a beta particle and gamma rays from a nucleus producing a slightly lighter, more stable nucleus.
13. The emission of a proton or neutron from a nucleus as a result of bombarding the nucleus with alpha particles, protons, deuterons, neutrons, etc.
14. The splitting of a very heavy nucleus into medium weight nuclei.
15. The combination of light-weight nuclei to form heavier, more stable nuclei.
16. A particle with zero atomic number and a mass number of one.
17. A device that accelerates electrons rather than positively charged particles as does the synchrotron.
18. A device in which particles travel in a straight line through many stages of small potential difference, which act to accelerate the particles.
19. Elements with more than 92 protons in their nuclei.
20. A radioactive isotope that is used to determine the course of chemical reactions.
21. A reaction in which the material or energy that starts the reaction is also one of the products.
22. A device in which the controlled fission of radioactive material produces new radioactive substances and energy.
23. A material that slows down fast neutrons and makes them more effective for producing nuclear changes.
24. A neutron-absorbing shaft inserted into a nuclear fuel lattice to limit the number of free neutrons.
25. The quantity of uranium necessary to maintain a chain reaction.
.26. 235U92 ===> 4He2 +
27. ==> 0e-1 +
28. ==> 4He2 +
29 ==> 0e-1 +
30 ==> 4He2 +
31 ==> 4He2 +
How many grams of a 200 g sample of C14 will remain after 16200 years. The half-life of C14 is 5400 years