RADIATION SAFETY AND RADIOBIOLOGY IN MEDICAL IMAGING
questions WITH WELL VERIFIED ANSWERS
10th Edition — CHAPTER ..s 1–16
Comprehensive Questions, Answers & Rationales
**Authors:** Mary Alice Statkiewicz Sherer, Paula J. Visconti, E. Russell Ritenour & Kelli Welch
Haynes
**Study note:** These are original study questions based on the subject areas and CHAPTER
.. organization of the 10th edition. The current 10th-edition CHAPTER .. sequence is confirmed
by Elsevier.
CHAPTER .. 1 — INTRODUCTION TO RADIATION PROTECTION
1. What is the primary goal of radiation protection?
A. Eliminate all radiation exposure
B. Prevent all medical imaging procedures
C. Minimize unnecessary radiation exposure while obtaining the required diagnostic information
D. Increase radiation dose to improve image quality
**Answer: C**
**Rationale:** Radiation protection seeks to minimize unnecessary exposure while allowing
radiation to be used when medically justified.
, 2. What principle is most closely associated with keeping radiation exposure as low as
reasonably achievable?
A. ALARA
B. LET
C. RBE
D. HVL
**Answer: A — ALARA**
**Rationale:** ALARA means **As Low As Reasonably Achievable**.
3. Which three factors are traditionally emphasized for reducing external radiation exposure?
A. kVp, mAs, and SID
B. Time, distance, and shielding
C. Filtration, collimation, and grid ratio
D. Frequency, wavelength, and velocity
**Answer: B**
**Rationale:** Reducing exposure time, increasing distance, and using appropriate shielding
are fundamental radiation-protection measures.
4. Which organization is primarily concerned internationally with recommendations concerning
radiation protection and exposure?
,A. ICRP
B. WHO only
C. OSHA only
D. FDA only
**Answer: A — ICRP**
**Rationale:** The International Commission on Radiological Protection develops
recommendations and guidance concerning protection against ionizing radiation.
---
### 5. What does the term "justification" mean in radiation protection?
A. Every possible imaging examination should be performed
B. An examination should provide sufficient expected benefit to outweigh its radiation risk
C. Radiation dose should always be maximized
D. Patients should never refuse imaging
**Answer: B**
---
### 6. Which action best demonstrates optimization?
, A. Using the highest possible exposure technique
B. Repeating images unnecessarily
C. Selecting techniques that achieve the needed diagnostic information with appropriate
radiation dose
D. Avoiding collimation
**Answer: C**
---
### 7. Why is radiation protection especially important in diagnostic imaging?
A. Ionizing radiation can produce biological effects
B. X-rays cannot interact with tissue
C. Radiation has no measurable energy
D. Medical imaging never exposes patients
**Answer: A**
---
### 8. What is the most appropriate attitude toward radiation exposure?
A. Any radiation exposure is automatically fatal
B. Radiation should be ignored because medical doses are harmless
C. Exposure should be justified and optimized
questions WITH WELL VERIFIED ANSWERS
10th Edition — CHAPTER ..s 1–16
Comprehensive Questions, Answers & Rationales
**Authors:** Mary Alice Statkiewicz Sherer, Paula J. Visconti, E. Russell Ritenour & Kelli Welch
Haynes
**Study note:** These are original study questions based on the subject areas and CHAPTER
.. organization of the 10th edition. The current 10th-edition CHAPTER .. sequence is confirmed
by Elsevier.
CHAPTER .. 1 — INTRODUCTION TO RADIATION PROTECTION
1. What is the primary goal of radiation protection?
A. Eliminate all radiation exposure
B. Prevent all medical imaging procedures
C. Minimize unnecessary radiation exposure while obtaining the required diagnostic information
D. Increase radiation dose to improve image quality
**Answer: C**
**Rationale:** Radiation protection seeks to minimize unnecessary exposure while allowing
radiation to be used when medically justified.
, 2. What principle is most closely associated with keeping radiation exposure as low as
reasonably achievable?
A. ALARA
B. LET
C. RBE
D. HVL
**Answer: A — ALARA**
**Rationale:** ALARA means **As Low As Reasonably Achievable**.
3. Which three factors are traditionally emphasized for reducing external radiation exposure?
A. kVp, mAs, and SID
B. Time, distance, and shielding
C. Filtration, collimation, and grid ratio
D. Frequency, wavelength, and velocity
**Answer: B**
**Rationale:** Reducing exposure time, increasing distance, and using appropriate shielding
are fundamental radiation-protection measures.
4. Which organization is primarily concerned internationally with recommendations concerning
radiation protection and exposure?
,A. ICRP
B. WHO only
C. OSHA only
D. FDA only
**Answer: A — ICRP**
**Rationale:** The International Commission on Radiological Protection develops
recommendations and guidance concerning protection against ionizing radiation.
---
### 5. What does the term "justification" mean in radiation protection?
A. Every possible imaging examination should be performed
B. An examination should provide sufficient expected benefit to outweigh its radiation risk
C. Radiation dose should always be maximized
D. Patients should never refuse imaging
**Answer: B**
---
### 6. Which action best demonstrates optimization?
, A. Using the highest possible exposure technique
B. Repeating images unnecessarily
C. Selecting techniques that achieve the needed diagnostic information with appropriate
radiation dose
D. Avoiding collimation
**Answer: C**
---
### 7. Why is radiation protection especially important in diagnostic imaging?
A. Ionizing radiation can produce biological effects
B. X-rays cannot interact with tissue
C. Radiation has no measurable energy
D. Medical imaging never exposes patients
**Answer: A**
---
### 8. What is the most appropriate attitude toward radiation exposure?
A. Any radiation exposure is automatically fatal
B. Radiation should be ignored because medical doses are harmless
C. Exposure should be justified and optimized
