Radiation Physics & Protection

Topics in this chapter

• Radiation Physics Fundamentals
• X-Ray Production and Filtration
• X-Ray Interactions With Matter
• Radiation Dosimetry and Dose Metrics
• Radiation Biology and Effects
• Radiation Protection and Dose Limits

Practice questions

1. Question 1Q-229C9E

   During diagnostic X-ray production, what percentage of the kinetic energy of electrons striking the tungsten target is converted into X-ray photons, with the remainder being dissipated as heat?

   1. A.Less than 1%
   2. B.About 10%
   3. C.About 50%
   4. D.Greater than 90%
   See the answer and solution
2. Question 2Q-908B7A

   Which of the following interaction mechanisms in diagnostic radiology involves an incoming X-ray photon interacting with an inner-shell electron, resulting in the complete absorption of the photon and emission of a photoelectron?

   1. A.Coherent scattering
   2. B.Compton scattering
   3. C.Photoelectric effect
   4. D.Pair production
   See the answer and solution
3. Question 3Q-A80894

   What is the primary mechanism responsible for image contrast degradation (fog) in conventional film-screen radiography and the main source of occupational radiation exposure during fluoroscopy?

   1. A.Coherent (Rayleigh) scattering
   2. B.Compton scattering
   3. C.Photoelectric absorption
   4. D.Pair production
   See the answer and solution
4. Question 4Q-EF87F7

   Which of the following radiation quantities is defined as the sum of the weighted equivalent doses in all specified tissues and organs of the body, reflecting the overall stochastic risk of ionizing radiation?

   1. A.Absorbed dose
   2. B.Equivalent dose
   3. C.Effective dose
   4. D.Exposure
   See the answer and solution
5. Question 5Q-08D56D

   According to current International Commission on Radiological Protection (ICRP) recommendations, what is the occupational dose limit for the lens of the eye, averaged over 5 consecutive years with no single year exceeding a specific limit?

   1. A.20 mSv per year
   2. B.50 mSv per year
   3. C.150 mSv per year
   4. D.500 mSv per year
   See the answer and solution