Radioactivity Crossword

7. Term used to describe materials that give out nuclear radiation
8. Piece of equipment used to measure radiation.
12. Gamma rays have a very ________ frequency.
13. Materials that are radioactive have nuclei that are ____________.
15. During alpha decay, the __________ __________ of the element decreases by 4.
17. Emitting gamma rays causes a nucleus to ________ it's energy state.
18. Type of radiation that is made up of a fast moving electron.
21. In beta decay, a ________ changes into a proton and an electron.

1. Type of radiation that is made up of two protons and two neutrons.
2. The charge of an alpha particle
3. During alpha decay the _________ __________ of the element decreases by 2.
4. Type of radiation that is a high energy electromagnetic wave.
5. The part of the atom that contains protons and neutrons
6. The release of radiation by unstable nuclei is known as __________ ____________.
9. Nuclei that are ________ _______ are likely to release beta particles.
10. During beta decay, the atomic number increases by ______.
11. The time taken for half of the nuclei in a radioactive material to decay.
14. Gamma rays have a very ________ wavelength.
16. Nuclei that are _______ _________ are likely to release alpha particles.
19. An unstable nucleus will _________ (split up) during radiation.
20. The structure made from sub-atomic particles.