radiation and nuclear energy

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