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