Raphex Exam || Most Recent Exam 2026-2027 Actual
Complete Real Exam Questions And Correct Answers
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Where should the beam spoiler for TBI treatments be placed? -
ANSWER -as close as possible to the patient's surface. The
surface dose contributed by the electrons generated from the
beam spoiler decreases as the distance between the screen
and the patient's surface increases.
the thickness of the spoiler depends on the beam energy
TBI skin dose - ANSWER -It should be at least 90% of the
prescribed TBI dose
Dose buildup data obtained at 100 cm SSD cannot be
accurately applied at
extended TB distances (e.g.
400 cm)
For TBI in vivo patient dosimetry, an agreement of ______ %
between the calculated and masured dose, and an overall dose
uniformity of _______ % is considered acceptable for most
protocols. - ANSWER -5; 10
_________ is not required after an HDR source
exchange a. Percent depth dose
,b. source positioning
c. source strength
d. timer linearity
e. a radiation safety survey - ANSWER -a. percent depth dose
difficult and unnecessary measurement. depth dose
characteristics are determined by the isotope and its
encapsulation
Disadvantage of beta sources for brachytherapy when
compared to gamma
sources - ANSWER -extremely rapid radial dose fall-off
within the target
According to the NRC, a radiation survey of all areas where
radiopharmaceuticals are prepared or administered is required
every _______. - ANSWER -day
When decontaminating a person involved in a radiation
incident, all of the following should be done except
____________.
a. repeating a whole body radiation survey after each
decontamination cycle
b. refraining from vigorous scrubbing
c. direct water washing the contaminated area away from the
person, rather than over the rest of the body d. using hot
water
, e. using soap with neutral pH - ANSWER -d. using hot
water hot water increases blood flow, potentially
enhancing the absorption of radioactive materials.
elastic vs. inelastic collisions - ANSWER -Inelastic collision -->
kinetic energy is
not
conserved
elastic collision --> kinetic energy is
conserved
bremsstrahlung interactions result from electron ________ -
ANSWER -inelastic
collisions with atomici
nucle
(kinetic energy is not conserved, production of photons
through momentum
conservation)
In a Compton interaction, the direction of the incoming photon
defines 0 degrees. As the angle of the scattered electron
increases, its energy ____________. As the angle of the
scattered photon increases, its energy
____________. - ANSWER -decreases; decreases
for either particle, the maximum energy is in the forward
direction, i.e. 0 degrees. The energy will decrease with
increasing angle.
Complete Real Exam Questions And Correct Answers
(Verified Answers) Already Graded A+ | Guaranteed
Success!! | Newest Exam | Just Released!!
Where should the beam spoiler for TBI treatments be placed? -
ANSWER -as close as possible to the patient's surface. The
surface dose contributed by the electrons generated from the
beam spoiler decreases as the distance between the screen
and the patient's surface increases.
the thickness of the spoiler depends on the beam energy
TBI skin dose - ANSWER -It should be at least 90% of the
prescribed TBI dose
Dose buildup data obtained at 100 cm SSD cannot be
accurately applied at
extended TB distances (e.g.
400 cm)
For TBI in vivo patient dosimetry, an agreement of ______ %
between the calculated and masured dose, and an overall dose
uniformity of _______ % is considered acceptable for most
protocols. - ANSWER -5; 10
_________ is not required after an HDR source
exchange a. Percent depth dose
,b. source positioning
c. source strength
d. timer linearity
e. a radiation safety survey - ANSWER -a. percent depth dose
difficult and unnecessary measurement. depth dose
characteristics are determined by the isotope and its
encapsulation
Disadvantage of beta sources for brachytherapy when
compared to gamma
sources - ANSWER -extremely rapid radial dose fall-off
within the target
According to the NRC, a radiation survey of all areas where
radiopharmaceuticals are prepared or administered is required
every _______. - ANSWER -day
When decontaminating a person involved in a radiation
incident, all of the following should be done except
____________.
a. repeating a whole body radiation survey after each
decontamination cycle
b. refraining from vigorous scrubbing
c. direct water washing the contaminated area away from the
person, rather than over the rest of the body d. using hot
water
, e. using soap with neutral pH - ANSWER -d. using hot
water hot water increases blood flow, potentially
enhancing the absorption of radioactive materials.
elastic vs. inelastic collisions - ANSWER -Inelastic collision -->
kinetic energy is
not
conserved
elastic collision --> kinetic energy is
conserved
bremsstrahlung interactions result from electron ________ -
ANSWER -inelastic
collisions with atomici
nucle
(kinetic energy is not conserved, production of photons
through momentum
conservation)
In a Compton interaction, the direction of the incoming photon
defines 0 degrees. As the angle of the scattered electron
increases, its energy ____________. As the angle of the
scattered photon increases, its energy
____________. - ANSWER -decreases; decreases
for either particle, the maximum energy is in the forward
direction, i.e. 0 degrees. The energy will decrease with
increasing angle.
