Presentation on theme: "-W ilhelm Conrad Roentgen-1895 -E lectrical discharges in a vacuum tube -C aused a phosphoric screen to fluoresce -F ormed an image of bone -F irst x-ray."— Presentation transcript:
-W ilhelm Conrad Roentgen E lectrical discharges in a vacuum tube -C aused a phosphoric screen to fluoresce -F ormed an image of bone -F irst x-ray photograph of wifes hand/ring
One year later British doctors were already using x- ray imaging. Prolonged exposure to x-rays caused tissue burns. Wounds were abnormal- took time before appearing.
-The energy of a light-wave is carried by packets called photons -The energy of a photon depends on the lights wavelength -Smaller wavelengths have larger energies
1 eV = 1.602x Joules Need 56,000,000,000, 000,000,000,000 eV to cook an egg. Photon energies are usually given in units of electron volts (eV)
X-ray tube consists of the following major parts 1- Filament: made from tungsten wire which is heated electrically at a potential difference of 8 to 12 V to a high temperature so that electrons boiled off from its surface. These electrons form the tube beam. The filament is located within a negatively charged nickel cathode which is shaped so that a precise beam geometry is obtained.
2- Cathode: this houses the filament and is manufactured from nickel. The filament is located within a cup having sharp contoured edges which electrostatically focus the electron beam. The cathode cup is independently supplied with a high negative voltage 3- Anode: is manufacture from tungsten (high melting metal). Dental units and small mobile X-ray units use stationary or fixed anode design. The most efficient design however uses a rotating-disk anode which enables higher X-ray output owing to more effective cooling.
Two Forks, Ball pin, and teeth brush in the intestine