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Sample Diagnostic Radiographer Practice Questions

Try these sample questions to review concepts for the Diagnostic Radiographer exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of the following X-ray interactions with matter is primarily responsible for generating high-contrast bone visualization in diagnostic radiography, and how does its probability scale with the atomic number (Z) of the absorber?
A.Compton scattering; scales proportionally with Z (Z^1)
B.Photoelectric effect; scales proportionally with Z cubed (Z^3)
C.Coherent scattering; scales proportionally with Z squared (Z^2)
D.Pair production; scales proportionally with Z cubed (Z^3)
Explanation: The photoelectric effect is the primary interaction responsible for subject contrast between bone and soft tissue because its probability of occurrence is proportional to the cube of the atomic number (Z^3) of the absorber material. Since bone has a higher effective atomic number (Z ≈ 13.8) compared to soft tissue (Z ≈ 7.4), bone absorbs significantly more photons photoelectrically, resulting in high radiographic contrast.
2Under the Radiation Ordinance (Cap. 303) of Hong Kong, what is the statutory annual effective dose limit for an occupational radiation worker?
A.1 mSv
B.5 mSv
C.20 mSv
D.50 mSv
Explanation: According to the Radiation Ordinance (Cap. 303) of Hong Kong, which aligns with the International Commission on Radiological Protection (ICRP) recommendations, the statutory annual effective dose limit for occupational radiation workers is 20 mSv, averaged over defined periods of 5 years, with no single year exceeding 50 mSv.
3Which of the following units is used to specify the total radiation energy deposited in a unit mass of tissue, and what is its SI unit definition?
A.Sievert (Sv); defined as J/kg, adjusted by a radiation weighting factor (w_R)
B.Gray (Gy); defined as J/kg of energy absorbed by the mass
C.Becquerel (Bq); defined as one disintegration per second
D.Coulomb per kilogram (C/kg); defined as the electrical charge produced in air
Explanation: The Gray (Gy) is the SI unit of absorbed dose, defined as the absorption of one joule of radiation energy per kilogram of matter (1 Gy = 1 J/kg). It measures the physical energy deposited without accounting for biological impact.
4How does increasing the total filtration in a diagnostic X-ray tube assembly affect the quality and quantity of the X-ray beam?
A.Increases both beam quality (average energy) and beam quantity (intensity)
B.Decreases beam quality (average energy) and increases beam quantity (intensity)
C.Increases beam quality (average energy) and decreases beam quantity (intensity)
D.Decreases both beam quality (average energy) and beam quantity (intensity)
Explanation: Increasing filtration removes low-energy ('soft') X-ray photons from the beam. This increases the average energy of the remaining photons (beam quality/hardening) while reducing the overall number of photons (beam quantity/intensity).
5Which of the following adjustments is most effective at reducing the intensity of scatter radiation reaching the image receptor while maintaining image density?
A.Increasing kVp and decreasing mAs
B.Increasing the grid ratio and increasing mAs
C.Increasing collimation (reducing field size) and decreasing filtration
D.Decreasing the source-to-image distance (SID) and increasing grid ratio
Explanation: Increasing the grid ratio is highly effective at absorbing scatter radiation before it reaches the image receptor. Because the grid also absorbs some primary beam photons, the mAs must be increased (using the grid conversion factor) to maintain the overall image receptor exposure (density).
6In X-ray tube design, what is the relationship between the actual focal spot size, the effective focal spot size, and the target angle according to the line-focus principle?
A.Effective focal spot size = Actual focal spot size / sine(target angle)
B.Effective focal spot size = Actual focal spot size * sine(target angle)
C.Effective focal spot size = Actual focal spot size * cosine(target angle)
D.Effective focal spot size = Actual focal spot size / cosine(target angle)
Explanation: According to the line-focus principle, the effective focal spot size (the projection of the focal spot onto the patient/image receptor) is equal to the actual focal spot size (the area bombarded by electrons on the anode target) multiplied by the sine of the target angle (effective = actual * sin(θ)). A smaller target angle yields a smaller effective focal spot, which improves spatial resolution while maintaining a larger actual area for heat dissipation.
7Which of the following biological effects of ionizing radiation is classified as a stochastic effect?
A.Radiation-induced cataracts
B.Erythema of the skin
C.Leukemia
D.Acute radiation syndrome (ARS)
Explanation: Leukemia and other cancers are stochastic (probabilistic) effects of radiation. Their probability of occurrence increases with dose, but their severity is independent of the dose. There is no biological threshold dose below which the probability is zero.
8What is the primary function of the personal Optically Stimulated Luminescence (OSL) dosimeter, and what material is used for its radiation detection?
A.Real-time dose readout; uses silicon diode detectors
B.Cumulative dose measurement; uses aluminum oxide (Al2O3)
C.Peak voltage measurement; uses lithium fluoride (LiF)
D.Surface contamination tracking; uses silver halide crystals
Explanation: OSL dosimeters are used to monitor cumulative occupational radiation exposure. They contain a thin layer of aluminum oxide (Al2O3) detection material, which stores energy from ionizing radiation. When stimulated with laser light, the material emits light proportional to the radiation dose received.
9Which of the following materials is most commonly used for secondary protective barriers in a diagnostic X-ray room, and what type of radiation is it designed to shield against?
A.Lead sheet (1.6 mm thickness); designed for the primary X-ray beam
B.Gypsum wallboard or lead-lined wood (0.8 mm lead equivalence); designed for leakage and scatter radiation
C.Concrete block (10 cm thickness); designed exclusively for neutron radiation
D.Barium sulfate plaster; designed for alpha and beta particles
Explanation: Secondary barriers are designed to protect areas from leakage radiation (from the tube housing) and scatter radiation (principally from the patient). They require less shielding thickness than primary barriers; standard materials include 0.8 mm (1/32 inch) lead equivalence, often achieved with standard gypsum wallboard or thin lead linings.
10How does the 'anode heel effect' influence the distribution of X-ray intensity along the cathode-anode axis, and how should a radiographer position the patient to utilize this effect during a thoracic spine examination?
A.Intensity is higher at the anode side; position the thicker anatomy under the anode
B.Intensity is higher at the cathode side; position the thicker anatomy under the cathode
C.Intensity is higher at the anode side; position the thinner anatomy under the anode
D.Intensity is higher at the cathode side; position the thinner anatomy under the cathode
Explanation: The anode heel effect occurs because X-rays produced deep within the target must travel through more anode material to exit on the anode side, resulting in greater attenuation. Therefore, the beam intensity is higher on the cathode side. For a thoracic spine exam, the thicker lower thoracic region should be placed under the cathode side of the beam to produce a more uniform image receptor exposure.

About the Diagnostic Radiographer Exam

This practice exam covers imaging physics, radiation protection, radiographic positioning, anatomy, CT, MRI, fluoroscopy, and image quality.

Exam sponsor: Radiographers Board of Hong Kong. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

100 multiple-choice questions

Time Limit

3 hours

Passing Score

60%

Exam / Certification Fees

Free

Exam sponsor website

Reported exam pass rate: ~75%. estimated pass rate This describes exam candidates, not OpenExamPrep users or results from using our resources. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

20%

Imaging Physics & Radiation Protection

X-ray production, interactions with matter, dosimetry, ICRP guidelines, and ALARA implementation.

20%

Radiographic Positioning & Anatomy

Chest, skeletal, abdomen positioning, projection criteria, and radiographic anatomy.

20%

CT, MRI & Cross-Sectional Imaging

CT scanning parameters, MRI safety, pulse sequences, and cross-sectional anatomy.

20%

Fluoroscopy & Special Procedures

Barium studies, angiography, mammography, and mobile/theatre radiography.

20%

Image Quality & Professional Standards

Artifact recognition, contrast/resolution optimization, local Code of Practice, and patient care.

Preparing for the Diagnostic Radiographer Exam

What You Need to Know

  • Passing score: 60%
  • Assessment: 100 multiple-choice questions
  • Time limit: 3 hours
  • Exam / certification fees: Free Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Frequently Asked Questions

What is the format of the Diagnostic Radiographer exam?

The exam consists of 100 multiple-choice questions covering all five content domains.

What is the passing score for the Diagnostic Radiographer exam?

Candidates must score at least 60% to pass the exam.