1|Page
RAPHEX Therapy EXAM || MOST RECENT EXAM 2026|
2027 ACTUAL COMPLETE REAL VERIFIED EXAM
QUESTIONS AND CORRECTLY WELL-DEFINED
ANSWERS (VEERIFIED ANSWERS) ALREADY
GRADED A+ | GUARANTEED SUCCESS!! NEWEST
EXAM!!!
The most probable interaction/s of electrons with the
tissue in the clinical energy rang is/are:
A. ionization and excitation
B. bremsstrahlung
C. elastic scattering
D. nuclear reaction
E. photodisintegration - Answer-A. ionization and
excitation
Charged particle equilibrium occurs when charged
particles leaving a volume and charged particles entering
the same volume have:
A. the same number of each type of particle at each
specific energy
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B. the same number of each type of particle, regardless of
energy
C. the same number of particles, although the particle
types may differ
D. the same total energy, regardless of whether the
particle types are the same
E. the same total energy, regardless of whether the
particle quantities are the same - Answer-A. the same
number of each type of particle at each specific energy
Of the following, a _____ is an absolute dosimeter.
A. free-air ionization chamber
B. calorimeter
C. ferrous sulfate (Fricke) dosimeter
D. All of the above
E. None of the above - Answer-D. All of the above
What is another name for radiological penumbra? -
Answer-physical penumbra
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A patient is being treated with a four-field box with 6MV x-
ray beams equally weighted to the prescription point. At
setup, it is noted that the AP beam's depth to the
prescription point is 2cm less than expected, and the
depths of the other 3 beams are unchanged. What is the
approximate dose difference at the prescription point?
A. 10% less than planned
B. 5% less than planned
C. 2% less than planned
D. 2% more than planned
E. 5% more than planned - Answer-D. 2% more than
planned. Assuming attenuation of 3.5%/cm, 3.5%*2/4 =
1.75%
For an MV photon treatment on a patient with a bolus
placed on top of an ill-fitting thermoplastic immobilization
mask, as an air gap between the bolus on the mask and
the patient surface increases, the depth of maximum dose
will ___ and the surface dose will ____.
A. decrease; decrease
B. increase; decrease
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C. decrease; increase
D. increase; increase
E. remain the same; decrease - Answer-B. increase;
decrease
Given a square field and an elongated rectangular field of
the same area, which would you expect to have the
greater percent depth dose for 4 MV photons? - Answer-
The square
Scatter from the corners of the rectangle has farther to
travel to the field center than scatter from the periphery of
the square and will contribute less to the depth dose.
Is penumbra sharper for lower or higher energy photons? -
Answer-Penumbra is sharper for lower energy photons
assuming the source size stays the same. Co-60 has a
larger penumbra due to having a larger source
A disadvantage of superficial x-rays compared to MeV
electrons for radiotherapy is:
A. sharper penumbra
B. higher bone dose
RAPHEX Therapy EXAM || MOST RECENT EXAM 2026|
2027 ACTUAL COMPLETE REAL VERIFIED EXAM
QUESTIONS AND CORRECTLY WELL-DEFINED
ANSWERS (VEERIFIED ANSWERS) ALREADY
GRADED A+ | GUARANTEED SUCCESS!! NEWEST
EXAM!!!
The most probable interaction/s of electrons with the
tissue in the clinical energy rang is/are:
A. ionization and excitation
B. bremsstrahlung
C. elastic scattering
D. nuclear reaction
E. photodisintegration - Answer-A. ionization and
excitation
Charged particle equilibrium occurs when charged
particles leaving a volume and charged particles entering
the same volume have:
A. the same number of each type of particle at each
specific energy
,2|Page
B. the same number of each type of particle, regardless of
energy
C. the same number of particles, although the particle
types may differ
D. the same total energy, regardless of whether the
particle types are the same
E. the same total energy, regardless of whether the
particle quantities are the same - Answer-A. the same
number of each type of particle at each specific energy
Of the following, a _____ is an absolute dosimeter.
A. free-air ionization chamber
B. calorimeter
C. ferrous sulfate (Fricke) dosimeter
D. All of the above
E. None of the above - Answer-D. All of the above
What is another name for radiological penumbra? -
Answer-physical penumbra
,3|Page
A patient is being treated with a four-field box with 6MV x-
ray beams equally weighted to the prescription point. At
setup, it is noted that the AP beam's depth to the
prescription point is 2cm less than expected, and the
depths of the other 3 beams are unchanged. What is the
approximate dose difference at the prescription point?
A. 10% less than planned
B. 5% less than planned
C. 2% less than planned
D. 2% more than planned
E. 5% more than planned - Answer-D. 2% more than
planned. Assuming attenuation of 3.5%/cm, 3.5%*2/4 =
1.75%
For an MV photon treatment on a patient with a bolus
placed on top of an ill-fitting thermoplastic immobilization
mask, as an air gap between the bolus on the mask and
the patient surface increases, the depth of maximum dose
will ___ and the surface dose will ____.
A. decrease; decrease
B. increase; decrease
, 4|Page
C. decrease; increase
D. increase; increase
E. remain the same; decrease - Answer-B. increase;
decrease
Given a square field and an elongated rectangular field of
the same area, which would you expect to have the
greater percent depth dose for 4 MV photons? - Answer-
The square
Scatter from the corners of the rectangle has farther to
travel to the field center than scatter from the periphery of
the square and will contribute less to the depth dose.
Is penumbra sharper for lower or higher energy photons? -
Answer-Penumbra is sharper for lower energy photons
assuming the source size stays the same. Co-60 has a
larger penumbra due to having a larger source
A disadvantage of superficial x-rays compared to MeV
electrons for radiotherapy is:
A. sharper penumbra
B. higher bone dose
