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Key Facts: SCFHS Nuclear Medicine Technologist Exam

150

Official MCQ count

SCFHS Nuclear Medicine Technologist Blueprint 2024

3 hours

Official exam duration

SCFHS Nuclear Medicine Technologist Blueprint 2024

60%

Licensure passing score

SCFHS Nuclear Medicine Technologist Blueprint 2024

33%

Largest section: Clinical Procedures

SCFHS Nuclear Medicine Technologist Blueprint 2024

Prometric

Delivery provider

Prometric SCFHS Examination Portal

The SCFHS Nuclear Medicine Technologist licensure examination is the official Saudi credentialing test for nuclear medicine technologists and specialists. Published blueprint specifications mandate 150 MCQs over a 3-hour Prometric testing window with a 60% passing score. The curriculum spans nine core areas with the heaviest emphasis on Clinical Procedures (33%), Physics and Radiation Safety (19%), and Patient Care (10%).

Sample SCFHS Nuclear Medicine Technologist Practice Questions

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

1A patient receives a diagnostic radiopharmaceutical with a physical half-life of 6.0 hours and an estimated biological half-life of 3.0 hours. What is the effective half-life of this tracer in the patient?
A.1.5 hours
B.2.0 hours
C.4.5 hours
D.9.0 hours
Explanation: The effective half-life (Te) is calculated using the harmonic relationship 1/Te = 1/Tp + 1/Tb, which yields Te = (Tp * Tb) / (Tp + Tb). Substituting 6.0 hours and 3.0 hours gives (6 * 3) / (6 + 3) = 18 / 9 = 2.0 hours. Effective half-life is always shorter than either the physical or biological half-life alone.
2Which interaction of ionizing radiation with matter predominates in soft tissue when diagnostic gamma photons with energies between 100 keV and 511 keV interact with low atomic number elements?
A.Pair production
B.Photoelectric absorption
C.Compton scattering
D.Coherent (Rayleigh) scattering
Explanation: Compton scattering is the predominant interaction mechanism in human soft tissue for photons in the diagnostic nuclear medicine energy range (approximately 100 keV to 511 keV). In this process, an incident photon ejects an outer-shell electron, losing part of its energy and deflecting at an angle. Photoelectric absorption dominates only at lower energies or in materials with high atomic numbers like lead.
3A nuclear medicine technologist standing 1.0 meter from an unshielded patient measures an exposure rate of 40 microSv/h. If the technologist steps back to a distance of 4.0 meters, what will the new exposure rate be?
A.2.5 microSv/h
B.5.0 microSv/h
C.10.0 microSv/h
D.20.0 microSv/h
Explanation: According to the inverse square law (I1 * d1^2 = I2 * d2^2), radiation intensity is inversely proportional to the square of the distance from a point source. Stepping from 1.0 m to 4.0 m quadruples the distance (factor of 4), reducing intensity by a factor of 4^2 = 16. Dividing 40 microSv/h by 16 yields 2.5 microSv/h.
4The half-value layer (HVL) of lead for technetium-99m gamma rays (140 keV) is approximately 0.27 mm. What thickness of lead shielding is required to attenuate the primary beam intensity to less than 12.5% of its initial unshielded value?
A.0.27 mm
B.0.54 mm
C.0.68 mm
D.0.81 mm
Explanation: Each half-value layer reduces the transmitted beam intensity by 50%. After 1 HVL the intensity is 50%, after 2 HVLs it is 25%, and after 3 HVLs it is 12.5%. Therefore, 3 HVLs are required to reach 12.5% transmission: 3 * 0.27 mm = 0.81 mm of lead.
5Which of the following correctly describes the relationship between the historical radiation unit Curie (Ci) and the International System (SI) unit Becquerel (Bq)?
A.1 mCi equals 3.7 x 10^4 Bq (37 kBq)
B.1 mCi equals 3.7 x 10^7 Bq (37 MBq)
C.1 Ci equals 1.0 x 10^6 Bq (1 MBq)
D.1 MBq equals 3.7 mCi (137 kBq)
Explanation: One Curie is defined as 3.7 x 10^10 disintegrations per second (Bq). Therefore, 1 millicurie (mCi) equals 3.7 x 10^7 Bq, which is commonly written as 37 Megabecquerels (MBq). Knowing this conversion is essential for calculating radiopharmaceutical activities and international transport documentation.
6Under international radiation protection recommendations (ICRP) and national regulatory frameworks, what is the annual occupational effective dose limit for whole-body radiation exposure in adult radiation workers?
A.20 mSv/year averaged over 5 years, max 50 mSv in one year
B.50 mSv per year averaged over 5 consecutive years, with no single year exceeding 100 mSv
C.5 mSv per year under all routine operational conditions
D.100 mSv per year with mandatory medical leave if exceeded
Explanation: The International Commission on Radiological Protection (ICRP Publication 103) and national regulatory bodies establish an occupational whole-body effective dose limit of 20 mSv per year averaged over defined periods of 5 years (100 mSv in 5 years), with the further constraint that the effective dose must not exceed 50 mSv in any single year.
7Following updated ICRP guidance adopted by radiation safety authorities, what is the occupational equivalent dose limit for the lens of the eye to prevent radiation-induced cataracts?
A.150 mSv per year, as in older guidance
B.50 mSv in any single calendar month
C.20 mSv/year averaged over 5 years, max 50 mSv in one year
D.500 mSv per year, as for skin and extremities
Explanation: The ICRP reduced the equivalent dose limit for the lens of the eye from 150 mSv/year to 20 mSv/year averaged over 5 consecutive years, with no single year exceeding 50 mSv. This change was based on epidemiological evidence demonstrating that the threshold for radiation-induced cataract formation is significantly lower than previously assumed.
8What is the annual occupational equivalent dose limit to the skin and extremities (hands and feet) for nuclear medicine technologists?
A.20 mSv per year
B.50 mSv per year
C.150 mSv per year
D.500 mSv per year
Explanation: The annual equivalent dose limit for the skin and extremities (hands, forearms, feet, and ankles) is 500 mSv (50 rem) per year. Nuclear medicine technologists wear extremity ring dosimeters (TLD or OSL) on the index finger of the dominant hand under gloves to ensure radiopharmaceutical manipulation stays well below this threshold.
9Once a female radiation worker formally declares her pregnancy in writing to the Radiation Safety Officer, what is the regulatory equivalent dose limit to the embryo/fetus for the remainder of the pregnancy?
A.0.1 mSv for the entire gestation
B.About 1 mSv to the fetus for the rest of the pregnancy
C.5 mSv per month throughout the second and third trimesters
D.10 mSv total equivalent dose
Explanation: Upon written declaration of pregnancy, the embryo/fetus is protected under public radiation limits. The regulatory equivalent dose limit to the embryo/fetus is 1 mSv (100 mrem) for the remainder of the pregnancy under ICRP guidelines (or 5 mSv total gestation with a constraint of 0.5 mSv per month under US NRC regulations). Monthly fetal badges worn at waist level under lead aprons monitor compliance.
10Which radiation survey instrument is most appropriate for measuring ambient exposure rates near a patient who received a high therapeutic dose of I-131, avoiding detector dead-time saturation?
A.An air-filled ionization chamber survey meter (Cutie Pie)
B.An end-window Geiger-Mueller (GM) counter set to audio clicks
C.A sodium iodide scintillation well counter
D.A pocket thermoluminescent dosimeter
Explanation: An air-filled ionization chamber (commonly called a Cutie Pie) is the instrument of choice for measuring high exposure rates accurately without suffering from dead-time saturation. Geiger-Mueller counters have long recovery dead times and jam or underestimate exposure rates in high radiation fields exceeding several mR/hr.

About the SCFHS Nuclear Medicine Technologist Exam

This resource is an independent English-language MCQ study adaptation created by OpenExamPrep for candidates preparing for the Saudi Licensure Examination for Nuclear Medicine Technologist (also designated as Nuclear Medicine Specialist on the SCFHS Classification Exams directory). The official examination consists of 150 multiple-choice questions administered over 3 hours at Prometric testing centers with a passing standard of 60%. Key subject domains evaluated include clinical procedures (33%), physics and radiation safety (19%), patient care (10%), radiopharmaceuticals (7%), instrumentation (7%), quality control (7%), image production and processing (6%), image interpretation and image artifacts (6%), and management and ethics (5%). OpenExamPrep is an independent educational resource and is not affiliated with, approved by, or sponsored by SCFHS or Prometric.

Exam sponsor: Saudi Commission for Health Specialties (SCFHS), administered through Prometric test centers. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The official SCFHS blueprint specifies 150 computer-based MCQs over 3 hours covering 9 content domains: Clinical Procedures 33%, Physics and Radiation Safety 19%, Patient Care 10%, Radiopharmaceuticals 7%, Instrumentation 7%, Quality Control 7%, Image Production/Processing 6%, Image Interpretation and Image Artifact 6%, and Management and Ethics 5%.

Time Limit

3 hours

Passing Score

60%

Exam / Certification Fees

Not published by SCFHS

Exam sponsor website

Reported exam pass rate: Not published. No official candidate pass-rate data for the Nuclear Medicine Technologist licensure exam is published by SCFHS. 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.

19%

Physics and Radiation Safety

Radioactive decay mechanisms, radiation interactions, radiation units, ALARA principles, shielding, dosimeters, regulatory dose limits, spill management, and waste disposal.

7%

Radiopharmaceuticals

Generator operation, elution physics, Mo-99 breakthrough, radiochemical purity, labeling kits, PET tracers, mechanisms of localization, and therapeutic radionuclides.

7%

Instrumentation

Anger scintillation camera electronics, crystal properties, collimator selection, SPECT gantry movement, PET coincidence detection, and dose calibrators.

7%

Quality Control

Dose calibrator accuracy, linearity, constancy, and geometry; daily flood uniformity; spatial resolution and linearity; SPECT center of rotation; and CT quality assurance.

33%

Clinical Procedures

Diagnostic protocols across cardiovascular, skeletal, pulmonary, endocrine, gastrointestinal, genitourinary, oncology, infection, and central nervous system imaging.

5%

Management and Ethics

Medical event reporting, regulatory compliance, informed consent, patient confidentiality, radioactive inventory logging, and professional scope of practice.

6%

Image Production/Processing

Matrix sizing, Nyquist criteria, filtered backprojection, iterative reconstruction, attenuation correction algorithms, and count statistics.

6%

Image Interpretation and Image Artifact

Identification of patient motion, soft-tissue attenuation, dose extravasation, PMT failure, collimator damage, and PET/CT misregistration.

10%

Patient Care

Patient identity verification, pregnancy and lactation precautions, pediatric dosage adjustments, emergency management, infection control, and post-therapy discharge guidelines.

Preparing for the SCFHS Nuclear Medicine Technologist Exam

What You Need to Know

  • Passing score: 60%
  • Assessment: The official SCFHS blueprint specifies 150 computer-based MCQs over 3 hours covering 9 content domains: Clinical Procedures 33%, Physics and Radiation Safety 19%, Patient Care 10%, Radiopharmaceuticals 7%, Instrumentation 7%, Quality Control 7%, Image Production/Processing 6%, Image Interpretation and Image Artifact 6%, and Management and Ethics 5%.
  • Time limit: 3 hours
  • Exam / certification fees: Not published by SCFHS 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

SCFHS Nuclear Medicine Technologist: Suggested Study Strategy

1Prioritize Clinical Procedures (33%) and Physics and Radiation Safety (19%), as these two domains account for over half of the entire examination score.
2Understand radionuclide generator kinetics, specifically the secular and transient equilibrium principles governing molybdenum-99/technetium-99m systems and breakthrough testing standards.
3Master routine quality control procedures, including daily dose calibrator constancy, flood field uniformity, and center of rotation (COR) calibration protocols.
4Review pharmacologic stress agents, contraindications, and reversal protocols for myocardial perfusion imaging, including the use of aminophylline for adenosine-induced bronchospasm.
5Familiarize yourself with radiation protection limits, including annual occupational dose limits, public limits, declared pregnant worker limits, and safe handling of therapeutic radiopharmaceuticals like I-131 and Lu-177.
6Pace yourself during practice sessions to solve approximately 50 questions per hour to mirror the real 150-question, 180-minute Prometric test pace.

Frequently Asked Questions

What is the official title of the SCFHS nuclear medicine examination?

The 2024 blueprint is titled Saudi Licensure Examination - Nuclear Medicine Technologist. SCFHS lists the exam on its Classification Exams page as Nuclear Medicine Specialist and links that blueprint.

How many questions are on the exam and what is the testing duration?

The official SCFHS blueprint establishes a 150 single-best-answer multiple-choice question format administered over a 3-hour computer-based testing session via Prometric.

What is the passing score for the Nuclear Medicine Technologist examination?

The passing standard set by the Saudi Commission for Health Specialties (SCFHS) for this licensure exam is 60%.

What are the major subject domains covered on the blueprint?

The exam evaluates nine domains: Clinical Procedures (33%), Physics and Radiation Safety (19%), Patient Care (10%), Radiopharmaceuticals (7%), Instrumentation (7%), Quality Control (7%), Image Production/Processing (6%), Image Interpretation and Image Artifact (6%), and Management and Ethics (5%).

How much does the exam cost?

SCFHS does not publish an exam fee on its Classification Exams page or in the blueprint. Check the current charges in Mumaris+ and when booking with Prometric.

Where is the examination administered and when are results released?

SCFHS sends classification exam candidates to the Prometric website to book a test center appointment. Prometric states that SCFHS exam results are posted in the SCFHS electronic portal within 7-10 working days.