Across
- 2. the shielding required to block gamma radiation
- 4. the element that is formed by the alpha decay of astatine-207
- 8. the nature of radiactive decay
- 11. the site from which radiation is emitted
- 12. an atom with the same number of protons as another but a different number of neutrons
- 13. a helium nucleus that is emitted from some radioactive nuclei [2 words]
- 16. the subatomic particle that is formed in the nucleus of an atom in beta decay
- 18. the number that tells you the number of protons in an element [2 words]
- 19. the weighted mean mass of an atom relative to 1/12 the mass of an atom of carbon-12 [3 words]
Down
- 1. the unit of activity of a radioactive sample
- 3. beta particle [3 words]
- 5. the number that tells you number of protons and neutrons in an isotope [2 words]
- 6. the % of a particular isotope on Earth [2 words]
- 7. radiation can be made up of particles or...
- 9. the instrument that is used to measure the activity of a radioactive sample [2 words]
- 10. the subatomic particle that decays in beta emission
- 14. the least penetrating form of radiation
- 15. the time taken for half a radioactive sample to decay [2 words]
- 17. the element that is formed by the beta decay of nickel-63