The threshold energy of pair production is 1.02 MeV.
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Describe Bragg peak and why it is beneficial in radiation th…
Describe Bragg peak and why it is beneficial in radiation therapy.
The fluence rate of a photon beam is the fluence per unit ti…
The fluence rate of a photon beam is the fluence per unit time.
An additional 2 cm of copper is added to the copper absorber…
An additional 2 cm of copper is added to the copper absorber in question #33. How many photons remain in the beam?
What coefficient is an important quantity in radiotherapy be…
What coefficient is an important quantity in radiotherapy because it helps predict biologic effects of radiation?
The photoelectric effect can only take place with electrons…
The photoelectric effect can only take place with electrons in the K and L shells.
A narrow beam of 5000 monoenergetic photons is reduced to 10…
A narrow beam of 5000 monoenergetic photons is reduced to 1000 photons by a copper absorber 2 cm thick. What is the linear attenuation coefficient of the copper absorber for these photons?
Three HVLs would reduce the intensity of the beam to _____ o…
Three HVLs would reduce the intensity of the beam to _____ of its original value.
No one kind of beam is ideal for radiation therapy.
No one kind of beam is ideal for radiation therapy.
If we consider a photon beam traversing through a material,…
If we consider a photon beam traversing through a material, the fraction of photon energy transferred into KE of charged particles per unit thickness of absorber is given by: