Missouri Radon Mitigation Specialist
Exam Practice Questions And Correct
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Rationales 2026 Q&A | Instant
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1. What is the primary health risk associated with long-term radon
exposure?
A. Asbestosis
B. Lung cancer
C. Skin cancer
D. Mesothelioma
Correct Answer: B. Lung cancer
Rationale: Radon decay products emit alpha particles that damage
lung tissue, significantly increasing lung cancer risk over time.
2. Radon is classified as which type of gas?
A. Synthetic gas
B. Man-made radioactive gas
, C. Naturally occurring radioactive gas
D. Non-radioactive inert gas
Correct Answer: C. Naturally occurring radioactive gas
Rationale: Radon is produced from the natural decay of uranium in
soil and rock.
3. The most common entry point for radon into homes is:
A. Roof vents
B. Plumbing fixtures
C. Foundation cracks
D. Windows
Correct Answer: C. Foundation cracks
Rationale: Radon typically enters through cracks and openings in
contact with soil.
4. Which device is most commonly used for long-term radon testing?
A. Charcoal canister
B. Continuous radon monitor
C. Alpha track detector
D. Electroscope
Correct Answer: C. Alpha track detector
Rationale: Alpha track detectors are used for long-term
measurements, usually 90+ days.
5. EPA action level for radon in homes is:
A. 0.4 pCi/L
, B. 2.0 pCi/L
C. 4.0 pCi/L
D. 10.0 pCi/L
Correct Answer: C. 4.0 pCi/L
Rationale: EPA recommends mitigation at or above 4.0 picocuries per
liter.
6. Radon gas is measured in:
A. ppm
B. mg/m³
C. pCi/L
D. becquerels per liter only
Correct Answer: C. pCi/L
Rationale: Picocuries per liter is the standard U.S. unit for radon
concentration.
7. Sub-slab depressurization systems primarily:
A. Seal roof leaks
B. Vent radon from soil beneath a building
C. Filter indoor air only
D. Increase indoor ventilation pressure
Correct Answer: B. Vent radon from soil beneath a building
Rationale: They create negative pressure under the slab to draw
radon away.
, 8. Radon comes from the decay of:
A. Carbon
B. Oxygen
C. Uranium
D. Nitrogen
Correct Answer: C. Uranium
Rationale: Uranium naturally decays into radium and then radon
gas.
9. Short-term radon tests typically last:
A. 1–2 hours
B. 2–7 days
C. 2–90 days
D. 1 year
Correct Answer: B. 2–7 days
Rationale: Short-term tests are usually conducted over a few days.
10. A key principle of radon mitigation is:
A. Increase indoor pressure
B. Prevent soil gas entry or redirect it outdoors
C. Seal all windows permanently
D. Use chemical neutralizers
Correct Answer: B. Prevent soil gas entry or redirect it outdoors
Rationale: Systems either block or vent radon before it enters
occupied space.
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary health risk associated with long-term radon
exposure?
A. Asbestosis
B. Lung cancer
C. Skin cancer
D. Mesothelioma
Correct Answer: B. Lung cancer
Rationale: Radon decay products emit alpha particles that damage
lung tissue, significantly increasing lung cancer risk over time.
2. Radon is classified as which type of gas?
A. Synthetic gas
B. Man-made radioactive gas
, C. Naturally occurring radioactive gas
D. Non-radioactive inert gas
Correct Answer: C. Naturally occurring radioactive gas
Rationale: Radon is produced from the natural decay of uranium in
soil and rock.
3. The most common entry point for radon into homes is:
A. Roof vents
B. Plumbing fixtures
C. Foundation cracks
D. Windows
Correct Answer: C. Foundation cracks
Rationale: Radon typically enters through cracks and openings in
contact with soil.
4. Which device is most commonly used for long-term radon testing?
A. Charcoal canister
B. Continuous radon monitor
C. Alpha track detector
D. Electroscope
Correct Answer: C. Alpha track detector
Rationale: Alpha track detectors are used for long-term
measurements, usually 90+ days.
5. EPA action level for radon in homes is:
A. 0.4 pCi/L
, B. 2.0 pCi/L
C. 4.0 pCi/L
D. 10.0 pCi/L
Correct Answer: C. 4.0 pCi/L
Rationale: EPA recommends mitigation at or above 4.0 picocuries per
liter.
6. Radon gas is measured in:
A. ppm
B. mg/m³
C. pCi/L
D. becquerels per liter only
Correct Answer: C. pCi/L
Rationale: Picocuries per liter is the standard U.S. unit for radon
concentration.
7. Sub-slab depressurization systems primarily:
A. Seal roof leaks
B. Vent radon from soil beneath a building
C. Filter indoor air only
D. Increase indoor ventilation pressure
Correct Answer: B. Vent radon from soil beneath a building
Rationale: They create negative pressure under the slab to draw
radon away.
, 8. Radon comes from the decay of:
A. Carbon
B. Oxygen
C. Uranium
D. Nitrogen
Correct Answer: C. Uranium
Rationale: Uranium naturally decays into radium and then radon
gas.
9. Short-term radon tests typically last:
A. 1–2 hours
B. 2–7 days
C. 2–90 days
D. 1 year
Correct Answer: B. 2–7 days
Rationale: Short-term tests are usually conducted over a few days.
10. A key principle of radon mitigation is:
A. Increase indoor pressure
B. Prevent soil gas entry or redirect it outdoors
C. Seal all windows permanently
D. Use chemical neutralizers
Correct Answer: B. Prevent soil gas entry or redirect it outdoors
Rationale: Systems either block or vent radon before it enters
occupied space.
