4GREATEST # OF PHOTONS IS EMITTED WITH ENERGY: APPROX. 1/3 OF MAXPHOTON ENERGY
5THE TARGET IS RELATIVELY THICK– CAUSING MULTIPLE INTERACTIONS. FOUR PRINCIPAL FACTORS INFLUENCING THE SHAPE OF AN X-RAY EMISSION SPECTRUM:ELCTRONS TRAVELING FROM CATHODE TO ANODE HAVE DIFFERENT ENERGIES– NOT JUST PEAK ENERGYTHE TARGET IS RELATIVELY THICK– CAUSING MULTIPLE INTERACTIONS.LOW ENERGY X-RAYS ARE MORE LIKELY ABSORBED IN THE TARGETEXTERNAL FILTRATION REMOVES LOW ENERGY PHOTONS
18EFFECTIVE DOSEPROVIDES A MEASURE OF THE OVERALL RISK OF EXPOSURE TO IONIZING RADIATION. UNIT OF OCCUPATIONAL EXPOSURE DOSE.1 Sv = 100 rem
19The SI derived unit of activity, usually meaning radioactivity The SI derived unit of activity, usually meaning radioactivity. "Radioactivity" is caused when atoms disintegrate, ejecting energetic particles
20RADIOACTIVITYThe SI derived unit of activity, usually meaning radioactivity. "Radioactivity" is caused when atoms disintegrate, ejecting energetic particles. One becquerel is the radiation caused by one disintegration per secondThe unit is named for a French physicist, Antoine-Henri Becquerel ( ), the discoverer of radioactivityOne curie was originally defined as the radioactivity of one gram of pure radium. In 1953 scientists agreed that the curie would represent exactly 3.7 x 1010 atomic disintegrations per secondThe unit is named for Pierre and Marie Curie, the discoverers of radium and polonium.