Minnesota Radon Measurement
Professional Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. What is radon?
A. A synthetic gas used in construction
B. A radioactive gas produced by the decay of uranium
C. A harmless atmospheric gas
D. A combustion byproduct
Answer: B. A radioactive gas produced by the decay of uranium
Rationale: Radon is a naturally occurring radioactive gas formed from the
breakdown of uranium in soil, rock, and water.
2. Radon is primarily measured in:
A. Volts
B. Amperes
, C. Picocuries per liter (pCi/L)
D. Gallons per minute
Answer: C. Picocuries per liter (pCi/L)
Rationale: Radon concentrations in air are commonly reported in pCi/L in
the United States.
3. The EPA action level for radon is:
A. 1.0 pCi/L
B. 2.0 pCi/L
C. 4.0 pCi/L
D. 10.0 pCi/L
Answer: C. 4.0 pCi/L
Rationale: EPA recommends mitigation when indoor radon levels are 4.0
pCi/L or higher.
4. Radon enters buildings primarily through:
A. Windows
B. Roof vents
C. Soil beneath the structure
D. Electrical wiring
Answer: C. Soil beneath the structure
,Rationale: Soil gas infiltration is the primary source of indoor radon.
5. Which health effect is most strongly associated with radon exposure?
A. Diabetes
B. Lung cancer
C. Cataracts
D. Heart disease
Answer: B. Lung cancer
Rationale: Radon exposure is the second leading cause of lung cancer in
the United States.
6. The decay product of radon most responsible for health risk is:
A. Oxygen
B. Nitrogen
C. Radon progeny
D. Carbon monoxide
Answer: C. Radon progeny
Rationale: Radioactive particles produced during radon decay can lodge in
the lungs.
7. A short-term radon test typically lasts:
A. Less than 90 days
B. More than one year
, C. Exactly one year
D. Five years
Answer: A. Less than 90 days
Rationale: Short-term tests generally range from 2 to 90 days.
8. A long-term radon test generally lasts:
A. 1 day
B. 2–7 days
C. More than 90 days
D. Exactly 30 days
Answer: C. More than 90 days
Rationale: Long-term testing provides a better estimate of annual average
radon concentration.
9. Closed-house conditions are typically required for:
A. Short-term testing
B. Landscaping work
C. Plumbing inspections
D. Electrical testing
Answer: A. Short-term testing
Professional Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is radon?
A. A synthetic gas used in construction
B. A radioactive gas produced by the decay of uranium
C. A harmless atmospheric gas
D. A combustion byproduct
Answer: B. A radioactive gas produced by the decay of uranium
Rationale: Radon is a naturally occurring radioactive gas formed from the
breakdown of uranium in soil, rock, and water.
2. Radon is primarily measured in:
A. Volts
B. Amperes
, C. Picocuries per liter (pCi/L)
D. Gallons per minute
Answer: C. Picocuries per liter (pCi/L)
Rationale: Radon concentrations in air are commonly reported in pCi/L in
the United States.
3. The EPA action level for radon is:
A. 1.0 pCi/L
B. 2.0 pCi/L
C. 4.0 pCi/L
D. 10.0 pCi/L
Answer: C. 4.0 pCi/L
Rationale: EPA recommends mitigation when indoor radon levels are 4.0
pCi/L or higher.
4. Radon enters buildings primarily through:
A. Windows
B. Roof vents
C. Soil beneath the structure
D. Electrical wiring
Answer: C. Soil beneath the structure
,Rationale: Soil gas infiltration is the primary source of indoor radon.
5. Which health effect is most strongly associated with radon exposure?
A. Diabetes
B. Lung cancer
C. Cataracts
D. Heart disease
Answer: B. Lung cancer
Rationale: Radon exposure is the second leading cause of lung cancer in
the United States.
6. The decay product of radon most responsible for health risk is:
A. Oxygen
B. Nitrogen
C. Radon progeny
D. Carbon monoxide
Answer: C. Radon progeny
Rationale: Radioactive particles produced during radon decay can lodge in
the lungs.
7. A short-term radon test typically lasts:
A. Less than 90 days
B. More than one year
, C. Exactly one year
D. Five years
Answer: A. Less than 90 days
Rationale: Short-term tests generally range from 2 to 90 days.
8. A long-term radon test generally lasts:
A. 1 day
B. 2–7 days
C. More than 90 days
D. Exactly 30 days
Answer: C. More than 90 days
Rationale: Long-term testing provides a better estimate of annual average
radon concentration.
9. Closed-house conditions are typically required for:
A. Short-term testing
B. Landscaping work
C. Plumbing inspections
D. Electrical testing
Answer: A. Short-term testing
