Across
- 4. Gamma rays can be used as a _______ to accumulate in specific tissues or organs for diagnostic purposes.
- 5. Process by which two nuclei fuse releasing energy.
- 6. Radiation that comes from natural and artificial sources and surrounds us at all times.
- 7. Alpha particles are composed of two protons and two neutrons - a _______ nuclei.
- 9. Beta radiation can pass through paper but is absorbed by a few centimetres of _______
- 10. Activity is the number of radioactive nuclei that _______ per second.
- 12. The Equivalent dose is the absorbed dose multiplied by the radiation _______ factor.
- 13. Increases the rate of reaction in a nuclear reactor.
- 18. Nuclear fusion requires the hydrogen fuel to be heated to such a high temperature it becomes _______.
- 19. The absorbed dose is energy absorbed per unit _______.
- 21. Negatively-charged particles in an atom.
- 24. The type of atom is determined by of these in the nucleus.
- 25. Process by which a nucleus splits into two pieces releasing energy.
Down
- 1. The process whereby an atom gains or loses electrons.
- 2. Famous nuclear disaster that occurred in Ukraine in 1986.
- 3. Common fuel for nuclear fission.
- 7. Time taken for the activity of a radioactive source to half.
- 8. Absorbed dose is measured in _______.
- 11. Decrease the rate of reaction in a nuclear reactor.
- 14. The total effect caused by exposure to radiation depends on the absorbed dose, type of ionising radiation and type of _______ exposed.
- 15. Process by which the neutrons produced in fission go onto to cause further fission reactions, which create more neutrons, which cause more fission reactions and so on.
- 16. Type of radiation that is part of the EM spectrum.
- 17. Radiation can ionise living tissue which can lead to _______.
- 20. Most common source of background radiation, a radioactive gas released from the ground.
- 22. You should always use these when handling radioactive sources.
- 23. Radiation causes photographic film to _______.