In beam modelling with Pinnacle RTPS,
For a 6MV beam:a) What is the maximum photon energy?b)...
In beam modelling with Pinnacle RTPS,
For a 6MV beam:a) What is the maximum photon energy?b) What is
the mean (roughly) photon energy?c) How does the spectrum affect
the depth dose penetration?
In beam modelling with Pinnacle RTPS, What is the role of the
flattening filter? What is the advantage of flattening filter free
and what is the main restriction.
In beam modelling with Pinnacle RTPS, What is the definition of
a “harder spectrum”? How would a “harder” 6MV spectrum change
theshape of the corresponding percentage depth-dose curve?
In beam modelling with Pinnacle RTPS, The source size is defined
to give geometric penumbra width, explain what else contributes to
thepenumbra width? Explain why width of D80-20 is used
to characterise penumbra width? Would the D80-20be
wider or narrower at high energy and why?
1. (a) A 210-MeV photon collides with an electron at rest. What
is the maximum energy loss of the photon?
(b) Repeat (a), but with a proton target rather than an
electron. Is the difference between the results reasonable? Why?
(Based upon BFG, Problem 4.12)
2. Find the de Broglie wavelength of (a) an electron with a
kinetic energy of 1 eV (b) an electron with a kinetic energy of 1
keV (c) an electron with a kinetic energy of...
Rank the following photons in order of their
energy, from greatest photon energy to least photon
energy. If the photon energy is the same in any two situations,
state this. Explain how you made your ranking. The speed
of light is c = 3.00 ´ 108 m/s.
(i) a photon with wavelength 600 nm = 6.00 ´ 10–7
m
(ii) a photon with wavelength 300 nm = 3.00 ´ 10–7
m
(iii) a photon with frequency 6.00 ´ 1014 Hz...
What is the energy of a photon whose momentum is the same as a
proton with the proton’s Kinetic energy being 100 MeV? What is the
velocity of the proton? If it enters a magnetic field of 2T what is
the radius of curvature of its path?