Missouri Radon Measurement
Technician Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. Radon is best described as:
A. A man-made chemical gas
B. A radioactive noble gas produced from uranium decay
C. A type of carbon monoxide
D. A biological toxin
Answer: B
Rationale: Radon is a naturally occurring radioactive gas formed from
the decay of uranium in soil, rock, and water.
2. The primary health risk associated with radon exposure is:
A. Skin irritation
B. Lung cancer
C. Liver disease
, D. Kidney failure
Answer: B
Rationale: Long-term radon exposure significantly increases the risk
of lung cancer, especially in smokers.
3. Radon typically enters buildings through:
A. Electrical wiring
B. Roof vents
C. Foundation cracks and openings
D. Windows only
Answer: C
Rationale: Radon moves from soil into buildings through cracks, gaps,
and openings in foundations.
4. The unit of measurement for radon concentration is:
A. ppm
B. µg/m³
C. pCi/L
D. dB
Answer: C
Rationale: Picocuries per liter (pCi/L) is the standard unit used in the
United States for radon measurement.
5. The EPA action level for radon in indoor air is:
A. 0.4 pCi/L
B. 2.0 pCi/L
, C. 4.0 pCi/L
D. 10.0 pCi/L
Answer: C
Rationale: EPA recommends mitigation if radon levels are at or above
4.0 pCi/L.
6. Radon is considered:
A. Chemically reactive
B. Odorless and colorless
C. Easily detectable by smell
D. Visible under UV light
Answer: B
Rationale: Radon cannot be seen, smelled, or tasted, making testing
essential.
7. The half-life of radon-222 is approximately:
A. 2 hours
B. 1 day
C. 3.8 days
D. 30 days
Answer: C
Rationale: Radon-222 has a half-life of 3.8 days, allowing it to
migrate into buildings.
8. Short-term radon tests typically last:
A. 1–2 hours
, B. 2–90 days
C. 1 year
D. 6 months
Answer: B
Rationale: Short-term tests range from 2 to 90 days depending on
device type.
9. Long-term radon tests typically last:
A. Less than 24 hours
B. 2–90 days
C. More than 90 days
D. Exactly 7 days
Answer: C
Rationale: Long-term tests provide more accurate annual average
concentrations.
10. Which device is commonly used for short-term radon
measurement?
A. Thermometer
B. Charcoal canister
C. Barometer
D. Hygrometer
Answer: B
Rationale: Charcoal canisters are widely used for short-term radon
sampling.
Technician Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Radon is best described as:
A. A man-made chemical gas
B. A radioactive noble gas produced from uranium decay
C. A type of carbon monoxide
D. A biological toxin
Answer: B
Rationale: Radon is a naturally occurring radioactive gas formed from
the decay of uranium in soil, rock, and water.
2. The primary health risk associated with radon exposure is:
A. Skin irritation
B. Lung cancer
C. Liver disease
, D. Kidney failure
Answer: B
Rationale: Long-term radon exposure significantly increases the risk
of lung cancer, especially in smokers.
3. Radon typically enters buildings through:
A. Electrical wiring
B. Roof vents
C. Foundation cracks and openings
D. Windows only
Answer: C
Rationale: Radon moves from soil into buildings through cracks, gaps,
and openings in foundations.
4. The unit of measurement for radon concentration is:
A. ppm
B. µg/m³
C. pCi/L
D. dB
Answer: C
Rationale: Picocuries per liter (pCi/L) is the standard unit used in the
United States for radon measurement.
5. The EPA action level for radon in indoor air is:
A. 0.4 pCi/L
B. 2.0 pCi/L
, C. 4.0 pCi/L
D. 10.0 pCi/L
Answer: C
Rationale: EPA recommends mitigation if radon levels are at or above
4.0 pCi/L.
6. Radon is considered:
A. Chemically reactive
B. Odorless and colorless
C. Easily detectable by smell
D. Visible under UV light
Answer: B
Rationale: Radon cannot be seen, smelled, or tasted, making testing
essential.
7. The half-life of radon-222 is approximately:
A. 2 hours
B. 1 day
C. 3.8 days
D. 30 days
Answer: C
Rationale: Radon-222 has a half-life of 3.8 days, allowing it to
migrate into buildings.
8. Short-term radon tests typically last:
A. 1–2 hours
, B. 2–90 days
C. 1 year
D. 6 months
Answer: B
Rationale: Short-term tests range from 2 to 90 days depending on
device type.
9. Long-term radon tests typically last:
A. Less than 24 hours
B. 2–90 days
C. More than 90 days
D. Exactly 7 days
Answer: C
Rationale: Long-term tests provide more accurate annual average
concentrations.
10. Which device is commonly used for short-term radon
measurement?
A. Thermometer
B. Charcoal canister
C. Barometer
D. Hygrometer
Answer: B
Rationale: Charcoal canisters are widely used for short-term radon
sampling.
