Radioisotopes at Work

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Across
  1. 1. a device used to manufacture fluorine-18
  2. 4. a radioisotope of this element is used for medicines used in PET imaging
  3. 7. most isotopes found in nature are ???
  4. 10. the radio isotope used most widely in nuclear medicine
  5. 11. this means to "cancel each other out" and occurs when a positron collides with an electron
  6. 13. the positively charged beta particle used in PET imaging
  7. 15. the particle name given to a helium nucleus
  8. 17. ____-life is the time it takes for half of a radioisotope to change into another substance
  9. 19. the material that undergoes beta decay to produce technicium 99m
  10. 21. unstable isotopes
  11. 23. two of these photons are formed when a positron and electron annihilate each other
  12. 25. other than charge, what don't gamma rays have?
  13. 26. the metal used in gowns to protect users of radioisotopes from harmful radiation
  14. 27. the type of radiation that can remove an electron as a result of a collision with an atom
  15. 30. other than internal tissue and beta rays can also dammage this part of the body
  16. 32. most artificial radioisotopes are manufactured in one of these
  17. 34. isotopes of an element have the same number of these
  18. 35. this type of medicine uses radioisotopes to look inside our bodies
Down
  1. 2. high doses of this type of radiation are used to kill what type of cells?
  2. 3. ionising radiation can to this to living cells
  3. 5. what the "O" in ANSTO stands for
  4. 6. a few mm of this metal can absorb beta particles
  5. 8. the type of reaction that takes place in the core of a nuclear reactor
  6. 9. the Greek word from which isotope is derived means same (iso) ????? (topos)
  7. 12. the word that the "T" in SPECT stands for in this type of imaging
  8. 14. this is used to stop gamma rays
  9. 16. alpha particles pose a threat if they get into this part of the body
  10. 18. the atomic mass is a weighted ??? of all the isotopes of a given element
  11. 20. the "m" in Technicium 99m stands for this
  12. 22. these are used in a cyclotron to bombard oxygen-18 to produce fluorine-18
  13. 24. some of these tumours use a lot of glucose
  14. 28. the atomic masses of isotopes are different because they contain different numbers of these subatomic particles
  15. 29. a layer of this can absorb alpha particles
  16. 30. what is a beta particle?
  17. 31. after this many half-lives, Technicium 99m is reduced to less than one thousandth of its original radiolactivity
  18. 33. materials used to make radioisotopes are bombarded with these in a nuclear reactor