a. The electrons that are boiled off the filament are attracted to the ___________.
b. The area on the target that the electrons strike is called the_________________.
c. The angle on the anode is usually between ____and ____degrees.
d. The exposure factor, ______, controls the speed of electrons flowing from the cathode to the anode.
e. The anode should be constructed of a material that has a high atomic number and high melting point. Two examples of suitable material are _________and____________.
In a x-ray tube, there are two main structures: the filament and the anode. To generate x-rays, electrons need to interact with a material with high atomic number, as they can thus manipulate the trajectory of flying electrons easier, and also allow for more electron-electron interactions to occur (because in comparison, low atomic number = less attractive force from the nucleus and generally less electrons as well). The higher melting point is required because the ...
The radiological physics targets are discussed.
Bremsstrahlung and Radiological Physics
6. Electron interactions were characterized by a ratio "b/a". The ratio "b/a" represents:
a) Orbital electron distance to nuclear radius
b) Photon wavelength to atomic radius
c) Impact parameter to atomic radius
d) Orbital electron radius to nuclear radius
7. The electron-electron interaction that results in brehmsstrahlung results when the ratio of the "Impact parameter to atomic radius is"
a) Much less than 1
b) Approximately equal to 1
c) Much more than 1
8. Which material would be the most appropriate for the target in the head of a linac based only on ability to produce brehmsstrahlung
a) Helium (Z = 2)
b) Sodium (Z = 11)
c) Iodine (Z - 53)
d) Tungsten (Z = 74)
9. Which class of dose calculation algorithm is the most accurate for radiation therapy?
b) Mode based
c) Monte Carlo
d) All of the above
10. Monte Carlo is
a) A city in Monaco
b) A way to solve tough problems using statistical sampling
c) An accurate but computationally-expensive way to simulate radiation transport
d) All of the above.