Radioisotopes at Work

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