Across
- 5. decrease in intensity of radiation passing through matter
- 8. process producing photons in a PET scan
- 9. effect of a frequency change of a wave from a moving object
- 10. computerised ___ ____ uses X-rays for 3-D imaging
- 14. electrons emitted by photon absorption
- 15. improves visibility of X-rays
- 16. radioisotope combined with other elements
- 19. detects radiation from injected radioisotopes
- 20. converts a photon into an electrical pulse
- 22. reversible effect in crystals converting strain into an emf
- 23. needed to 'see' X-rays
Down
- 1. converts gamma photons into light photons
- 2. describes a temporary high energy state radioisotope
- 3. Technetium-99m and Fluorine-18 are one of these
- 4. absorbs X-rays
- 6. when 2 materials have similar impedance values
- 7. product of density times speed of sound in a material
- 11. a cathode producing electrons
- 12. you are put in this for a CAT scan
- 13. Compton scattering is one of these
- 17. emits pulses of high frequency sound
- 18. sound above 20 kHz
- 21. doesn't absorb X-rays much