Across
- 2. changes into a proton and electron during beta decay
- 6. not affected by any external factors
- 7. cannot predict which nucleus will decay or when
- 8. most penetrating type of radiation
- 10. same number of protons but different number of neutrons
- 11. part of the atom where protons and neutrons are found
- 13. alpha particles can be stopped by a sheet of this
Down
- 1. when an isotope of carbon is used to determine the age of a material
- 3. a word to describe a nucleus of a radioactive isotope
- 4. moderately penetrating and moderately ionising
- 5. the time taken for the activity of a sample to fall to half of its original value
- 9. the most ionising type of radiation
- 12. a dense metal used to stop radiation