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Radiation Therapy Certification Review Exam Questions and Answers
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  • Course
  • Radiation therapy
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  • Radiation Therapy

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 Isotopes have the same number of ______ but different number of _________ - Answer-protons, neutrons With beta decay: A. Characteristic x-rays...

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  • October 7, 2024
  • 11
  • 2024/2025
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  • radiation therapy certification review exam questi
  • the orbital electron shell that is closest to the

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Radiation Therapy Certification Review
Exam Questions and Answers
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

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
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

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

What term describes the relationship with beam intensity and distance from the source
of a beam for photons as it travels through some medium?
A. linear attenuation coefficient
B. inverse square law
C. quantum model
D. transmission proportionality - Answer-

Which of the following is not a filter used for low-energy treatment machines?
A. Copper
B. Thoraeus
C. Tungsten
D. Aluminum - Answer-

Which photon interaction with matter is most likely to occur with diagnostic imaging? -
Answer-photoelectric effect

Which photon interaction with matter is most likely to occur with radiation therapy
delivery via linear accelerators? - Answer-Compton effect

Which photon interaction with matter is most likely to occur with radiation therapy
delivery via orthovoltage?
A. coherent scattering
B. photoelectric effect
C. Compton effect
D. pair production
E. photodisintegration - Answer-

What interaction is responsible for neutron contamination in radiation therapy? -
Answer-photodisintegration

Pair production occurs in ____.
A. photon beams greater than 1.022 keV
B. photon beams greater than 1.022 MeV
C. electron beams greater than 1.022 keV
D. electron beams greater than 1.022 MeV - Answer-

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