medical physics

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Across
  1. 1. sound above 20 kHz
  2. 5. doesn't absorb X-rays much
  3. 8. converts gamma photons into light photons
  4. 9. you are put in this for a CAT scan
  5. 10. decrease in intensity of radiation passing through matter
  6. 13. and Fluorine-18 are one of these
  7. 17. absorbs X-rays
  8. 19. electrons emitted by photon absorption
  9. 20. radioisotope combined with other elements
  10. 22. reversible effect in crystals converting strain into an emf
  11. 23. detects radiation from injected radioisotopes
Down
  1. 2. process producing photons in a PET scan
  2. 3. improves visibility of X-rays
  3. 4. describes a temporary high energy state radioisotope
  4. 6. product of density times speed of sound in a material
  5. 7. needed to 'see' X-rays
  6. 11. a cathode producing electrons
  7. 12. computerised ___ ____ uses X-rays for 3-D imaging
  8. 14. effect of a frequency change of a wave from a moving object
  9. 15. when 2 materials have similar impedance values
  10. 16. Compton scattering is one of these
  11. 18. converts a photon into an electrical pulse
  12. 21. emits pulses of high frequency sound