Dosimetry Board Review Exam Actual
Questions and Answers 2026
What term best describes a major influence on image resolution for
most CT scanners: -
correct answer ✅Voxel
Photon Energy Formula -
correct answer ✅E=hv=hc/wl
E=hf=hc/wavelength(lambda) h=Planck constant = 6.6261x10^-34
JS
Speed of light = 3e8
f=photon frequency
lambda = photon wavelength
Which instrument would be the most appropriate choice for
monitoring radiation leakage from a Cobalt-60 source (with the
source in the off position)? -
correct answer ✅radiotherapy verification film
The number of atoms in one gram for any material is equal to: -
correct answer ✅Avogadro's number divided by the density of the
material
, Dosimetry Board Review Exam Actual
Questions and Answers 2026
Which of the following is true regarding orthovoltage X-rays? -
correct answer ✅They have a half-value layer between 1-4 mm Cu.
What is a systematic error as defined in radiation oncology? -
correct answer ✅It is the variation in the translation of treatment
setup from simulator to the treatment unit.
Examples of radiation-induced, chronic skin changes do NOT
include: -
correct answer ✅moist desquamation.
Which of the following techniques would be appropriate to
improve the calculated dose homogeneity in tangential
megavoltage radiotherapy of the breast? -
correct answer ✅lung density correction in treatment planning
A photon field abutting an electron field at the skin surface will
result in a: -
correct answer ✅photon side hot spot and electron side cold spot
ICRU -62 is a method of delineation of an Internal Target Volume
(ITV) to provide extra margin for: -
Questions and Answers 2026
What term best describes a major influence on image resolution for
most CT scanners: -
correct answer ✅Voxel
Photon Energy Formula -
correct answer ✅E=hv=hc/wl
E=hf=hc/wavelength(lambda) h=Planck constant = 6.6261x10^-34
JS
Speed of light = 3e8
f=photon frequency
lambda = photon wavelength
Which instrument would be the most appropriate choice for
monitoring radiation leakage from a Cobalt-60 source (with the
source in the off position)? -
correct answer ✅radiotherapy verification film
The number of atoms in one gram for any material is equal to: -
correct answer ✅Avogadro's number divided by the density of the
material
, Dosimetry Board Review Exam Actual
Questions and Answers 2026
Which of the following is true regarding orthovoltage X-rays? -
correct answer ✅They have a half-value layer between 1-4 mm Cu.
What is a systematic error as defined in radiation oncology? -
correct answer ✅It is the variation in the translation of treatment
setup from simulator to the treatment unit.
Examples of radiation-induced, chronic skin changes do NOT
include: -
correct answer ✅moist desquamation.
Which of the following techniques would be appropriate to
improve the calculated dose homogeneity in tangential
megavoltage radiotherapy of the breast? -
correct answer ✅lung density correction in treatment planning
A photon field abutting an electron field at the skin surface will
result in a: -
correct answer ✅photon side hot spot and electron side cold spot
ICRU -62 is a method of delineation of an Internal Target Volume
(ITV) to provide extra margin for: -
