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100+ Free Therapeutic Radiographer Practice Questions
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Sample Therapeutic Radiographer Practice Questions
Try these sample questions to test your Therapeutic Radiographer exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1In megavoltage photon beams, which interaction is the dominant contributor to dose deposition in soft tissue?
A.Photoelectric effect
B.Compton scattering
C.Pair production
D.Coherent scattering
Explanation: In the megavoltage energy range typical of radiation therapy (1 to 20 MeV), Compton scattering is the dominant photon interaction in soft tissue. Photoelectric effect dominates at low energies (< 25 keV in tissue), pair production dominates above 10 MeV (particularly in high-Z materials, but in tissue Compton still dominates up to about 25 MeV), and coherent scattering does not transfer energy to the medium.
2What is the primary function of the bending magnet in a medical linear accelerator?
A.To focus the electron beam to a smaller focal spot size
B.To deflect the electron beam through a specific angle (e.g., 270 or 90 degrees) to hit the target or scattering foil
C.To accelerate the electrons to megavoltage energies within the waveguide
D.To monitor the dose rate, flatness, and symmetry of the beam
Explanation: The bending magnet deflects the accelerated electron beam coming out of the horizontal accelerating waveguide through a specific angle (commonly 270 degrees in modern 'achromatic' bending magnet systems) to direct it vertically down toward the X-ray target or electron scattering foil.
3For a 6 MV photon beam, at what depth (d_max) does the maximum dose deposition typically occur in water?
A.0.5 cm
B.1.5 cm
C.2.5 cm
D.3.0 cm
Explanation: The depth of maximum dose (d_max) represents the build-up region depth where electronic equilibrium is reached. For a 6 MV photon beam, d_max is typically at 1.5 cm. For Cobalt-60 it is 0.5 cm, for 10 MV it is 2.5 cm, and for 15 MV it is 3.0 cm.
4In electron beam therapy, what is the approximate relationship between the energy (E in MeV) of the electron beam and its practical range (Rp in cm) in water?
A.Rp ≈ E / 4
B.Rp ≈ E / 2
C.Rp ≈ E * 2
D.Rp ≈ E / 3
Explanation: A standard clinical rule of thumb is that the practical range (Rp) of an electron beam in centimeters of water is approximately equal to half of its energy in MeV (Rp ≈ E/2). For example, a 12 MeV electron beam has a practical range of about 6 cm.
5Which of the following is true regarding the TG-51 calibration protocol for clinical reference dosimetry?
A.It utilizes an air-kerma calibration factor (Nk)
B.It requires the use of a water calorimeter as the active detector
C.It specifies reference dosimetry based on absorbed-dose-to-water calibration factor (Nd,w)
D.It is only applicable to Cobalt-60 beams
Explanation: The AAPM TG-51 protocol is based on absorbed-dose-to-water calibration factors (Nd,w) for ionization chambers in a standard Cobalt-60 beam, which are then corrected using a beam quality conversion factor (kq) for clinical high-energy photon and electron beams.
6What is the primary function of a flattening filter in a megavoltage linear accelerator?
A.To produce a uniform dose distribution across the field at a reference depth
B.To remove low-energy photons from the beam to decrease skin dose
C.To convert the electron beam into bremsstrahlung X-ray photons
D.To collimate the beam into a rectangular or square shape
Explanation: The raw bremsstrahlung beam produced when electrons hit the target is highly forward-peaked. The flattening filter (typically made of lead, steel, or brass) is thicker in the center to attenuate the central axis dose, resulting in a flat, uniform dose profile across the field at a reference depth (usually 10 cm).
7Which radioactive isotope is most commonly used as the source in high-dose-rate (HDR) brachytherapy remote afterloaders?
A.Cesium-137
B.Iridium-192
C.Iodine-125
D.Palladium-103
Explanation: Iridium-192 (192Ir) is the standard radionuclide used in HDR brachytherapy. It has a high specific activity (allowing small source size of < 1 mm diameter), an average gamma energy of 380 keV (easy to shield compared to Co-60), and a half-life of 73.8 days, which requires source replacement about 3-4 times per year.
8How does the percentage depth dose (PDD) of a megavoltage photon beam change with an increase in Source-to-Surface Distance (SSD)?
A.PDD decreases as SSD increases
B.PDD increases as SSD increases
C.PDD remains constant regardless of SSD changes
D.PDD first increases then decreases due to air scatter
Explanation: PDD increases with an increase in SSD due to the inverse square law effect. The Mayneord F-factor quantitatively shows that as the SSD is increased, the relative difference in distance between the d_max point and the depth point d decreases, which increases the PDD.
9Which of the following describes the 'skin-sparing effect' in megavoltage photon beams?
A.Low absorption of high-energy photons by the epidermis
B.The electronic build-up region where dose increases from a low surface value to a maximum at d_max
C.Geometric shielding of the skin surface by the primary collimator jaws
D.Reduced backscattering of secondary electrons from the air-skin interface
Explanation: The skin-sparing effect occurs because high-energy photons set in motion secondary electrons that travel predominantly in the forward direction. The number of these electrons increases with depth until electronic equilibrium is reached at d_max. Consequently, the surface dose is relatively low (typically 10-30% of d_max), sparing the skin.
10In a linear accelerator, what device is used to generate or amplify microwave power for accelerating electrons in high-energy (> 10 MeV) machines?
A.Magnetron
B.Klystron
C.Thyratron
D.Waveguide
Explanation: A klystron is a high-power microwave amplifier that requires an external radiofrequency (RF) driver. It is used in higher-energy accelerators (usually > 10 MeV) because it provides stable, very high power output. Lower-energy machines (e.g., 6 MV) often use a magnetron, which is a microwave oscillator.
About the Therapeutic Radiographer Exam
This practice exam covers radiation physics, dosimetry, radiobiology, radiation protection, treatment planning, simulator CT, treatment delivery, and patient care.
Assessment
100 multiple-choice questions
Time Limit
3 hours
Passing Score
60%
Exam Fee
Free (Radiographers Board of Hong Kong)
Therapeutic Radiographer Exam Content Outline
20%
Radiation Physics & Dosimetry
Linear accelerator physics, electron/photon beam characteristics, and absolute/relative dosimetry measurement.
20%
Radiobiology & Radiation Protection
Cell survival curves, fractionation principles, late/early side effects, and radiotherapy room shielding safety.
20%
Treatment Planning & Simulator CT
CT simulation, virtual simulation, volume definition (GTV, CTV, PTV), OAR constraints, and 3DCRT/IMRT planning.
20%
Treatment Delivery Techniques
IMRT, VMAT, IGRT protocols, patient setup/immobilization, and machine QA checks.
20%
Patient Care & Oncological Management
Common cancers (lung, breast, prostate, head & neck), management of side effects, and palliative care.
How to Pass the Therapeutic Radiographer Exam
What You Need to Know
- Passing score: 60%
- Assessment: 100 multiple-choice questions
- Time limit: 3 hours
- Exam fee: Free
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
Frequently Asked Questions
What is the format of the Therapeutic Radiographer exam?
The exam consists of 100 multiple-choice questions covering all five content domains.
What is the passing score for the Therapeutic Radiographer exam?
Candidates must score at least 60% to pass the exam.