X-ray production/ X-ray emission Flashcards
At 80 kVp, of all the energy in the electrons stream, ____ is converted to ____ and ____ is converted into ____.
99.4 %
Heat
0.6%
x-rays
Of all the x-rays in the primary beam produced at 80 kVp, ___ is ___; and ___ is ___.
90%
Brems
10%
Characteristic
What is the efficiency of x-ray production at 95 kVp with a tungsten target?
.703
Wavelength is represented by the greek letter ___ whose symbol is ____.
Lambda y (upside down y)
The energy of a Brems photon is dependent on what?
The distance of the incident electron from the nucleus of the target atom
To increase the probability of Characteristic radiation forming, the target should have a high…
Atomic number
You have the following technique set on the control panel: 95 kVp, 200 mA, 1/20 sec. What is the minimum wavelength of any photon in the primary beam?
0.13A
What is the useful range of wavelengths for diagnostic radiology?
0.1A to 0.5A
What is the approximate energy of the maximum number of Brems photons produced with the following technique: 120 kVp, 200 mA, 1/5 sec?
40 keV
Given that tungsten has 6 electron shells, what is the number of different characteristic x-ray energies that can be produced?
15
As you proceed to the lower left end of the electromagnetic spectrum, the wavelength of the radiation at this end becomes…
Longer
What is the maximum energy of any photon in the primary beam produced at 90 kVp using a tungsten anode (Z=74)?
90 keV
Characteristic radiation will not be produced with a tungsten anode if the kVp falls below what value?
69
What is the result of Characteristic radiation production?
- Characteristic photon
- Photoelectron
- Ion pair
Given that the wavelength of a certain x-ray photon is 0.35A, what is the energy of the photon?
35.4 keV
One incident (projectile electron from the cathode can undergo multiple interactions at the target. T/F
True
Electromagnetic radiation is the transport of energy through space as a combination of…
Electric and magnetic fields
As per the quantum theory of the behavior of x-rays, the photon energy is ____ proportional to its frequency.
Directly
An electron with 70 keV may produce an x-ray photon with which of the following? 70, 20, 1 keV
Any of them
The energy of a characteristic x-ray depends on the ______ ______ of the electron knocked out of the target atom and the binding energy of the electron that falls into it’s hole.
Binding energy
Increasing the mA setting on the x-ray tube, with all other parts of the technique remaining the same, will result in…
More projectile electrons with the same energy
Characteristic x-rays produced when an electron is knocked out of which electron shell have the best energy level for diagnostic imaging?
k Shell
The energy of Bremsstrahlung x-rays…
Covers a wide spectrum of energy levels
When the kVp is set in the range of 100-150 kVp, most of the x-rays produced are…
Bremsstrahlung
