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NMTCB Radiation Safety Newest Exam Preparation
With Complete Questions And Correct Answers With
Rationales Already Graded A+Brand New Version!!
Question 1
What is ionizing radiation?
A) Radiation incapable of interacting with matter
B) Radiation with sufficient energy to remove electrons from atoms
C) Visible light only
D) Sound energy
Answer: B
Rationale: Ionizing radiation has enough energy to remove orbital
electrons from atoms, creating ions. This distinguishes it from non-
ionizing radiation such as visible light, radio waves, and sound energy.
Question 2
Which is an example of electromagnetic ionizing radiation?
A) Radio waves
B) Microwaves
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C) Gamma rays
D) Ultrasound
Answer: C
Rationale: Gamma rays are high-energy electromagnetic radiation
capable of ionization. Radio waves, microwaves, and ultrasound are
non-ionizing forms of radiation.
Question 3
What is the SI unit of absorbed dose?
A) Sievert
B) Gray
C) Becquerel
D) Coulomb/kg
Answer: B
Rationale: The gray (Gy) measures absorbed radiation energy per unit
mass, specifically one joule per kilogram.
Question 4
What is the SI unit of equivalent/effective dose?
A) Gray
B) Becquerel
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C) Sievert
D) Curie
Answer: C
Rationale: The sievert (Sv) accounts for both radiation weighting factors
and tissue weighting factors in dose quantities, making it the unit for
equivalent and effective dose.
Question 5
What is the SI unit of radioactive activity?
A) Gray
B) Sievert
C) Becquerel
D) Roentgen
Answer: C
Rationale: One becquerel represents one nuclear transformation per
second. The becquerel replaced the curie as the SI unit of activity.
Question 6
One becquerel represents:
A) One decay per minute
B) One decay per second
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C) One decay per hour
D) One decay per day
Answer: B
Rationale: The becquerel is defined as one nuclear disintegration or
transformation per second.
Question 7
Beta-minus radiation consists of:
A) Electrons
B) Positrons only
C) Helium nuclei
D) Neutrons
Answer: A
Rationale: Beta-minus decay emits a high-energy electron from the
nucleus when a neutron converts to a proton.
Question 8
A positron has:
A) The same mass as an electron and positive charge
B) A negative charge and twice the mass of an electron
C) No charge
NMTCB Radiation Safety Newest Exam Preparation
With Complete Questions And Correct Answers With
Rationales Already Graded A+Brand New Version!!
Question 1
What is ionizing radiation?
A) Radiation incapable of interacting with matter
B) Radiation with sufficient energy to remove electrons from atoms
C) Visible light only
D) Sound energy
Answer: B
Rationale: Ionizing radiation has enough energy to remove orbital
electrons from atoms, creating ions. This distinguishes it from non-
ionizing radiation such as visible light, radio waves, and sound energy.
Question 2
Which is an example of electromagnetic ionizing radiation?
A) Radio waves
B) Microwaves
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C) Gamma rays
D) Ultrasound
Answer: C
Rationale: Gamma rays are high-energy electromagnetic radiation
capable of ionization. Radio waves, microwaves, and ultrasound are
non-ionizing forms of radiation.
Question 3
What is the SI unit of absorbed dose?
A) Sievert
B) Gray
C) Becquerel
D) Coulomb/kg
Answer: B
Rationale: The gray (Gy) measures absorbed radiation energy per unit
mass, specifically one joule per kilogram.
Question 4
What is the SI unit of equivalent/effective dose?
A) Gray
B) Becquerel
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C) Sievert
D) Curie
Answer: C
Rationale: The sievert (Sv) accounts for both radiation weighting factors
and tissue weighting factors in dose quantities, making it the unit for
equivalent and effective dose.
Question 5
What is the SI unit of radioactive activity?
A) Gray
B) Sievert
C) Becquerel
D) Roentgen
Answer: C
Rationale: One becquerel represents one nuclear transformation per
second. The becquerel replaced the curie as the SI unit of activity.
Question 6
One becquerel represents:
A) One decay per minute
B) One decay per second
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C) One decay per hour
D) One decay per day
Answer: B
Rationale: The becquerel is defined as one nuclear disintegration or
transformation per second.
Question 7
Beta-minus radiation consists of:
A) Electrons
B) Positrons only
C) Helium nuclei
D) Neutrons
Answer: A
Rationale: Beta-minus decay emits a high-energy electron from the
nucleus when a neutron converts to a proton.
Question 8
A positron has:
A) The same mass as an electron and positive charge
B) A negative charge and twice the mass of an electron
C) No charge
