Across
- 3. Process in which neutrons from one fission event cause further fissions in surrounding nuclei
- 5. High speed electron or positron emitted from an unstable nucleus
- 8. Use of radioisotopes inside the body for diagnosis and treatment
- 9. High frequency electromagnetic waves produced by fast electrons decelerating used in imaging and capable of ionisation
- 12. Nucleus remaining after radioactive decay which is more stable than the original
- 13. SI unit of equivalent and effective dose representing biological damage
- 15. Unstable isotope of an element that undergoes radioactive decay
- 17. Sum of tissue equivalent doses weighted by tissue weighting factors
- 19. Time taken for half of a group of unstable nuclei in a sample to decay
- 20. Joining of small nuclei to form a larger more stable nucleus releasing energy
- 24. Graph showing number of undecayed nuclei in a sample versus time elapsed
- 26. Charged particle formed when an atom gains or loses electrons
- 27. Radioactive substance introduced into the body to track organ function
- 30. Use of ionising radiation to treat disease especially cancers
- 31. Particle accelerator used to produce some medical radioisotopes
- 32. Uncharged reactive fragment of a molecule formed when a bond is broken by radiation
- 35. Splitting of a large nucleus into smaller more stable nuclei releasing energy
- 36. Change in DNA sequence that can be caused by ionising radiation
- 38. Part of a cell surrounding the nucleus where water molecules can be ionised by radiation
- 39. Radioisotope widely used in diagnostic imaging of bones heart and other organs
- 40. Disease involving uncontrolled cell division sometimes caused or treated by radiation
Down
- 1. Dimensionless factor representing relative biological effect of a type of radiation
- 2. Particle found in the nucleus either a proton or a neutron
- 4. Energy absorbed per kilogram of irradiated tissue measured in grays
- 6. Measure of radiation dose that accounts for radiation type and biological effect
- 7. Sequence of decays that a radioisotope passes through to become stable
- 10. Slow moving nuclear particle consisting of two protons and two neutrons released from an unstable nucleus
- 11. Difference between mass of reactants and products in a nuclear reaction associated with released energy
- 14. Atom of same element with same number of protons but different number of neutrons
- 16. Energy required to separate a nucleus into its individual nucleons
- 18. Radiation Naturally occurring environmental ionising radiation from space rocks and other sources
- 21. SI unit of absorbed dose equal to one joule per kilogram
- 22. Neutron absorbing rods inserted into a reactor core to control the fission rate
- 23. Material used in a reactor to slow down neutrons so they can cause fission
- 25. Process of increasing the proportion of uranium two three five in uranium fuel
- 28. High energy radiation that can remove electrons from atoms to create ions
- 29. Smallest mass of fissile material that can sustain an uncontrolled chain reaction
- 33. Number of decays of a radioactive source per second measured in becquerels
- 34. Unit of activity equal to one nuclear decay per second
- 37. High energy electromagnetic radiation emitted from an excited nucleus becoming more stable