EB IRRSP EXAM NEWEST 2026 ACTUAL EXAM|
COMPLETE REAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY
GRADED A+| EB IRRSP EXAM REVIEW 2026|| BRAND
NEW!!
1. What is accelerated toward a high atomic number target in
order to produce X-rays?
A) Neutrons
B) Protons
C) Electrons
D) Nuclei
Correct Answer: C
Rationale: X-rays are produced when a beam of high-speed
electrons is accelerated and suddenly stopped by a high-atomic-
number target (such as tungsten). The kinetic energy of the
1
,electrons is converted into X-ray photons upon impact. This is the
fundamental principle of X-ray tube operation .
2. What is the most fundamental difference between X-rays
and gamma rays?
A) Intensity
B) Wavelength
C) Penetrability
D) Origin
Correct Answer: D
Rationale: X-rays and gamma rays are both forms of
electromagnetic radiation with similar properties. Their most
fundamental difference lies in their origin: X-rays are produced
outside the nucleus (via electron interactions), while gamma rays
originate from within the atomic nucleus during radioactive decay .
3. Which form of radiation has a higher quality factor (QF)
than X-rays?
2
,A) Ultraviolet
B) Infrared
C) Alpha
D) Beta
Correct Answer: C
*Rationale: The quality factor (QF) adjusts for the relative
biological effectiveness of different types of radiation. Alpha
particles have a QF of 20 (or 10-20 depending on regulatory
framework), while X-rays, gamma rays, and beta particles have
a QF of 1. This means alpha radiation causes significantly more
biological damage per unit of absorbed dose .*
4. The term for the dose equivalent of X-rays is:
A) Rad
B) Roentgen
C) Rem
D) Absorbed dose
3
, Correct Answer: C
*Rationale: The "rem" (Roentgen Equivalent Man) is the unit of
dose equivalent, which accounts for both the absorbed energy
(rads) and the biological effectiveness (quality factor) of the
radiation. For X-rays, 1 rad = 1 rem because the QF is 1. The
roentgen measures exposure in air, not dose equivalent .*
5. What percentage of a source's initial activity remains after 6
half-lives?
A) 16.70%
B) 6.70%
C) 3.10%
D) 1.60%
Correct Answer: D
*Rationale: After each half-life, the activity decreases by 50%.
After 1 half-life: 50%; 2: 25%; 3: 12.5%; 4: 6.25%; 5: 3.125%;
6: 1.5625% (approximately 1.6%). This exponential decay is
4
COMPLETE REAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY
GRADED A+| EB IRRSP EXAM REVIEW 2026|| BRAND
NEW!!
1. What is accelerated toward a high atomic number target in
order to produce X-rays?
A) Neutrons
B) Protons
C) Electrons
D) Nuclei
Correct Answer: C
Rationale: X-rays are produced when a beam of high-speed
electrons is accelerated and suddenly stopped by a high-atomic-
number target (such as tungsten). The kinetic energy of the
1
,electrons is converted into X-ray photons upon impact. This is the
fundamental principle of X-ray tube operation .
2. What is the most fundamental difference between X-rays
and gamma rays?
A) Intensity
B) Wavelength
C) Penetrability
D) Origin
Correct Answer: D
Rationale: X-rays and gamma rays are both forms of
electromagnetic radiation with similar properties. Their most
fundamental difference lies in their origin: X-rays are produced
outside the nucleus (via electron interactions), while gamma rays
originate from within the atomic nucleus during radioactive decay .
3. Which form of radiation has a higher quality factor (QF)
than X-rays?
2
,A) Ultraviolet
B) Infrared
C) Alpha
D) Beta
Correct Answer: C
*Rationale: The quality factor (QF) adjusts for the relative
biological effectiveness of different types of radiation. Alpha
particles have a QF of 20 (or 10-20 depending on regulatory
framework), while X-rays, gamma rays, and beta particles have
a QF of 1. This means alpha radiation causes significantly more
biological damage per unit of absorbed dose .*
4. The term for the dose equivalent of X-rays is:
A) Rad
B) Roentgen
C) Rem
D) Absorbed dose
3
, Correct Answer: C
*Rationale: The "rem" (Roentgen Equivalent Man) is the unit of
dose equivalent, which accounts for both the absorbed energy
(rads) and the biological effectiveness (quality factor) of the
radiation. For X-rays, 1 rad = 1 rem because the QF is 1. The
roentgen measures exposure in air, not dose equivalent .*
5. What percentage of a source's initial activity remains after 6
half-lives?
A) 16.70%
B) 6.70%
C) 3.10%
D) 1.60%
Correct Answer: D
*Rationale: After each half-life, the activity decreases by 50%.
After 1 half-life: 50%; 2: 25%; 3: 12.5%; 4: 6.25%; 5: 3.125%;
6: 1.5625% (approximately 1.6%). This exponential decay is
4
