Physics Revision

Physics Revision

1. MEDICAL USES

   • X-Rays
     • Part of the ELECTROMAGNETIC SPECTRUM
     • Properties make them USEFUL IN MEDICINE
       • Produce DETAILED IMAGES
         • Can be used for DENTAL TREATMENT
           • DECAYED teeth ABSORB LESS
         • Traditionally 2D
           • CT SCANS look from MORE THAN ONE ANGLE to produce 3D
             • CT SCAN Computerised Tomography Scan
       • Radiography TREATS CANCER
     • HAZARDOUS
       • PRECAUTIONS taken to protect medical staff
     • ELECTROMAGNETIC WAVES
     • TRANSFER energy and are TRANSVERSE WAVES
       • TRANSVERSE WAVES Oscillations are perpendicular to the energy transfer.
       • OSCILLATIONS The 'waves' on a radio wave
     • Very SHORT wavelength
       • Roughly the SIZE OF AN ATOM
     • Cause IONISATION
       • IONISATION The adding or removing of electrons in atoms and molecules
       • Can damage DNA cells
     • Turn PHOTOGRAPHIC FILM black
       • In the same way as visible light
     • Absorbed/stopped by METAL and BONE
       • TRANSMITTED by HEALTHY TISSUE
         • TRANSMITTED Pass through
   • ULTRASOUND
     • HIGH FREQUENCY sound waves
     • DIAGNOSE DISEASE
     • Often used in PRE-NATAL scans
       • PRE-NATAL Before birth
     • Medical TREATMENT of KIDNEY STONES