Radioactivity GCSE revision

12345678910111213141516171819
Across
  1. 3. Unit for activity
  2. 6. About 5mm of this is needed to stop betas.
  3. 11. When a person or object receives a dose of radiation
  4. 12. Fusing of lighter nuclei to make a heavier nucleus
  5. 13. About 5cm of this is enough to stop alphas.
  6. 15. If radioactive particles end up on a surface or person that they shouldn't
  7. 17. A thin sheet of this is enough to stop alphas.
  8. 18. About 5cm of this needed to stop gamma radiation
  9. 19. Number for the total number of protons & neutrons
Down
  1. 1. The rate that radiation is emitted from a nucleus
  2. 2. Pudding model of atom that came before Rutherford's
  3. 4. Particles with no charge needed to start fission
  4. 5. Counter used to detect ionising radiation
  5. 6. Number for the number of protons
  6. 7. Fast moving electron emitted from a nucleus
  7. 8. Process where electrons are knocked out of atoms
  8. 9. An alpha particle is the same as this nucleus
  9. 10. Splitting a massive nucleus into 2 lighter nuclei
  10. 14. Electromagnetic radiation emitted by a nucleus
  11. 16. Particle made from 2 protons & 2 neutrons