| Physics 1 | Physics 2 | Physics 3 | Physics 4 | Physics 5 |
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It is independent of atomic number for the medium.
What is the relationship between the Mass Attenuation Coefficient for Compton Scattering in relation to atomic number?
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There will be an increase of the total number of photons produced.
For an X Ray tube, what happens if you use a platinum target (Z=78) compared to that of a tungsten target (Z =74)?
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Low particle mass and high Z medium
Under what conditions will the probability of bremsstrahlung interactions most likely occur in relation to particle mass and Z number?
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Z3/E3
What is the probability of photo electric absorption in regards to Z and energy?
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6.7 cm by 6.7 cm
If the area of a photon beam is 12 cm X 12 cm at a distance of 100 cm from the source, what is the area of the beam at 56 cm from the source?
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It is the energy transferred from photons to charged particles.
What is the definition of KERMA?
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2MeV / cm
What is the Stopping Power in water of a 6MeV electron beam?
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Energy of a photon
What does the expression hc/λ define?
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When it's a direct hit and the photon is scattered at 180 degrees back.
When is the maximum energy imparted to the electron during Compton Scatter?
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22.3%
A beam containing 103 photons is incident on a slab of material which is 15 cm thick. The Linear Attenuation Coefficient for this material is µ = 0.10 cm-1. Calculate the % Transmission?
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Low photon energy and high atomic number of the medium.
What conditions increases probability of photoelectric absorption in regards to energy and atomic number?
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Ψ (μTRANSFER / ρ) g
What is the expression that describes the Radiative component of KERMA?
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0.511 MeV
What is the relative rest mass of an electron?
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The amount of material to attenuate a photon beam by 50%
What is the definition of 1 HVL?
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9 HVL
A 12 cm Lead block is used to attenuate a photon beam over the spine. Given that the µ for lead is 0.52 cm-1, what is the thickness of the block in HVL?
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It causes the treatment head to be radioactive in the linear accelerator?
How dose Photo Nuclear Disintegration (PIN) occur?
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Coulomb / Mass
What are the units of exposure?
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When an atom is ionized, an electron moves from a higher orbital to a lower orbital releasing a characteristic photon.
What is the cause of characteristic X Rays?
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1.022 MeV
What is the threshold for a photon to interact by pair production?
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0.1300 cm -1
A 7 cm thick slab of material reduces the intensity of a beam to 40 % of its original value. What is the Linear Attenuation Coefficient of this material?
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HVL is inversely proportional to the Linear Attenuation Coefficient.
What is the relationship between HVL for a Poly Energetic beam and the Linear Attenuation Coefficient?
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Ψ (μABSORB/ ρ)
What is the expression that describes the Collisional component of KERMA?
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Rare
Photon interactions are _______ compared to electron interactions?
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1 Joule
Which of the following quantities is equivalent to 1 kg.m2/s2 ?
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2.48 X 10-13 m
What is the wavelength of a 5 MeV photon?
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