1|Page
ONS Radiation Therapy Certificate Exam ||Verified
Exam!!!||Questions with Correct Answers and
explanations LATEST THIS YEAR -JUST
RELEASED.pdf 1||NEWEST EXAM!!!
Which of the following is true regarding the wavelength
frequencies of electromagnetic radiation?
A. Wavelength is measured in hertz
B. Wavelength and frequency are inversely related
C. The product of frequency and wavelength is Planck's
constant
D. Frequency is represented by lambda - Answer-B
When calculating attenuation with this formula, I = I*e-
(mu)x, what does mu represent? - Answer-linear
attenuation coefficient
____ describes the thickness of the medium needed to
attenuate the beam's original intensity in half. - Answer-
half value layer
Which photon interaction with matter is most likely to occur
with diagnostic imaging? - Answer-photoelectric effect
,2|Page
Which photon interaction with matter is most likely to occur
with radiation therapy delivery via linear accelerators? -
Answer-Compton effect
What interaction is responsible for neutron contamination
in radiation therapy? - Answer-photodisintegration
Proton and alpha particles exhibit a ____ peak at the end
of their range of travel, where most of their energy is
deposited.
A. Bragg
B. bremsstrahlung
C. characteristic
D. Auger - Answer-A. Bragg
The orbital electron shell that is closest to the nucleus is: -
Answer-K
The number of protons in an atom is also known as: -
Answer-Atomic number
,3|Page
Isotopes have the same number of ______ but different
number of _________ - Answer-protons, neutrons
With beta decay:
A. Characteristic x-rays and Auger electrons are produced
B. A positron and negatron are emitted from the nucleus
C. A helium nucleus is emitted
D. A proton is transformed into a neutron - Answer-B
With electron capture (choose all correct answers):
A. Characteristic x-rays and Auger electrons are produced
B. Occurs in high Z materials
C. A helium nucleus is emitted
D. A proton is transformed into a neutron - Answer-A and
D
Which of the following radioisotopes is used for LDR GYN
brachytherapy?
A. I-131
B. Cs-137
C. Pd-103
, 4|Page
D. Ir-192 - Answer-B
The half-life of Pd-103 is:
A. 74.2 days
B. 30 years
C. 17 days
D. 2.7 days - Answer-C
Which of the following is not a type of electromagnetic
radiation?
A. Microwaves
B. Neutrons
C. X-rays
D. Radiowaves - Answer-B
Oncology - Answer-Study of a large Variety of disease that
behave similar way with lethal potential. Study of
neoplastic disease.
ONS Radiation Therapy Certificate Exam ||Verified
Exam!!!||Questions with Correct Answers and
explanations LATEST THIS YEAR -JUST
RELEASED.pdf 1||NEWEST EXAM!!!
Which of the following is true regarding the wavelength
frequencies of electromagnetic radiation?
A. Wavelength is measured in hertz
B. Wavelength and frequency are inversely related
C. The product of frequency and wavelength is Planck's
constant
D. Frequency is represented by lambda - Answer-B
When calculating attenuation with this formula, I = I*e-
(mu)x, what does mu represent? - Answer-linear
attenuation coefficient
____ describes the thickness of the medium needed to
attenuate the beam's original intensity in half. - Answer-
half value layer
Which photon interaction with matter is most likely to occur
with diagnostic imaging? - Answer-photoelectric effect
,2|Page
Which photon interaction with matter is most likely to occur
with radiation therapy delivery via linear accelerators? -
Answer-Compton effect
What interaction is responsible for neutron contamination
in radiation therapy? - Answer-photodisintegration
Proton and alpha particles exhibit a ____ peak at the end
of their range of travel, where most of their energy is
deposited.
A. Bragg
B. bremsstrahlung
C. characteristic
D. Auger - Answer-A. Bragg
The orbital electron shell that is closest to the nucleus is: -
Answer-K
The number of protons in an atom is also known as: -
Answer-Atomic number
,3|Page
Isotopes have the same number of ______ but different
number of _________ - Answer-protons, neutrons
With beta decay:
A. Characteristic x-rays and Auger electrons are produced
B. A positron and negatron are emitted from the nucleus
C. A helium nucleus is emitted
D. A proton is transformed into a neutron - Answer-B
With electron capture (choose all correct answers):
A. Characteristic x-rays and Auger electrons are produced
B. Occurs in high Z materials
C. A helium nucleus is emitted
D. A proton is transformed into a neutron - Answer-A and
D
Which of the following radioisotopes is used for LDR GYN
brachytherapy?
A. I-131
B. Cs-137
C. Pd-103
, 4|Page
D. Ir-192 - Answer-B
The half-life of Pd-103 is:
A. 74.2 days
B. 30 years
C. 17 days
D. 2.7 days - Answer-C
Which of the following is not a type of electromagnetic
radiation?
A. Microwaves
B. Neutrons
C. X-rays
D. Radiowaves - Answer-B
Oncology - Answer-Study of a large Variety of disease that
behave similar way with lethal potential. Study of
neoplastic disease.
