Across
- 1. The time taken for activity to halve.
- 3. Uncharged particle emitted from the nucleus.
- 8. Unwanted presence of radioactive atoms.
- 10. Nuclear radiation identical to helium nuclei.
- 11. The rate at which decay happens.
- 12. Fast moving electrons ejected from the nuclei of atoms.
Down
- 2. Process of exposing material to nuclear radiation
- 4. The number of decays per second.
- 5. The giving out of radiation.
- 6. Type of radiation that can add or remove electrons from an atom.
- 7. Condition of an atom before it decays.
- 9. Electromagnetic radiation from the nucleus.