Radioactivity Crossword

2. Gamma rays have a very ________ frequency.
6. Materials that are radioactive have nuclei that are ____________.
9. Type of radiation that is made up of two protons and two neutrons.
11. During alpha decay the _________ __________ of the element decreases by 2.
13. In beta decay, a ________ changes into a proton and an electron.
14. The release of radiation by unstable nuclei is known as __________ ____________.
15. Nuclei that are ________ _______ are likely to release beta particles.
16. The charge of an alpha particle
17. Type of radiation that is a high energy electromagnetic wave.
19. Emitting gamma rays causes a nucleus to ________ it's energy state.
21. The time taken for half of the nuclei in a radioactive material to decay.

1. Gamma rays have a very ________ wavelength.
3. During alpha decay, the __________ __________ of the element decreases by 4.
4. Piece of equipment used to measure radiation.
5. Type of radiation that is made up of a fast moving electron.
7. Term used to describe materials that give out nuclear radiation
8. The part of the atom that contains protons and neutrons
10. Nuclei that are _______ _________ are likely to release alpha particles.
12. The structure made from sub-atomic particles.
18. An unstable nucleus will _________ (split up) during radiation.
20. During beta decay, the atomic number increases by ______.