Question | Answer |
All electromagnetic radiations have the same ________ but differ in _______ and ___________. | Velocity
Wavelength
Frequency |
(More or Less)_______ energetic radiations have shorter wavelength and higher frequency. | More |
A high-speed electron is deflected from its path and the loss of kinetic energy is emitted in the form of an x-ray phonton; is __________ Radiation. | Bremsstrahlung |
A high-speed electron ejects a tungsten K-shell electron, leaving a K-shell vacancy. An electron from the L shell fills the vacancy and emits a K-characteristic ray; is ___________ Radiation. | Characteristic |
A relatively low-energy x-ray photon interacts with tissue and uses all its energy to eject an inner shell electron; is _________ Effect. | Photoelectric |
A fairly high-energy x-ray photon interacts with tissue and ejects an outer shell electron; is _________ Scatter. | Compton |
Low LET radiations deposit (more or less) energy in cells/tissues along their path, than high-LET radiations. | Less |
Usually a result of high dose in short period of time; is (early or late) effects. | Early |
threshold, non-linear, all early effects, some late effects; is (deterministic or stochastic). | Deterministic |
no threshold, linear, genetic effects, cancer, most late effects; is (deterministic or stochastic). | Stochastic |
Diagnostic x-rays have _____ wavelengths and are considered ____ LET radiation. | extremly short
low |
How are wavelength and energy related? | Inversely |
Collimators must be accurate to within ____% of the SID. | 2% |
Made of aluminum and used to reduce patient dose by removing low-energy photons is ________? | Filtration |
<50 kV requires ___mm AL equivalent filtration. | .5 |
50-70 kV requires __mm AL equivalent filtration. | 1.5 |
>70 kV requires __mm AL equivalent filtration. | 2.5 |
AEC (can or cannot)compensate for a speed system. | cannot |
Function to remove a large % of scattered radiation from the remnant beam before reaching the IR, improving the radiographic contrast; is________? | Grid |
Using high-speed film and screen combination can (inc. or dec.) patient dose. | dec. |
Primary radiation barriers must be __feet high. | 7 |
Measure of dose to tissue? | Rem (Sv) |
Crystals used in an optically luminescent dosimetry system? | Aluminum oxide |
Unit of measurement used for occupational exposure? | Rem (Sv) |
Pb thick. 75kV 100kV
.25 mm - 66% - 51%
.50 mm - 88% - 75%
1.0 mm - 99% - 94%
this chart is ________? | Attenuation Characteristics of Lead Aprons |