Nevada Radon Measurement
Technician Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which unit is used to measure radon concentration in air in the United
States?
A. Becquerels per cubic meter
B. Picocuries per liter
C. Grams per cubic meter
D. Parts per million
The United States standard unit for measuring radon in air is
picocuries per liter (pCi/L), whereas Bq/m³ is used internationally.
2. What is the EPA action level for indoor radon concentration?
A. 2.0 pCi/L
B. 3.5 pCi/L
C. 4.0 pCi/L
D. 10.0 pCi/L
The EPA recommends mitigation when radon levels reach or exceed
4.0 pCi/L due to increased health risks.
3. Radon is classified as which type of hazard?
A. Chemical hazard
B. Biological hazard
C. Physical hazard
D. Radiological hazard
Radon is a radioactive gas that emits ionizing radiation, making it a
radiological hazard.
,4. What is the primary source of radon in homes?
A. Household cleaning products
B. Soil beneath the structure
C. Outdoor air pollution
D. Water heaters
Radon gas originates from the decay of uranium in soil and enters
buildings through foundation cracks.
5. Which type of radiation is emitted by radon decay products?
A. Beta radiation only
B. Gamma radiation only
C. Alpha radiation primarily
D. Infrared radiation
Radon progeny emit alpha particles, which are highly damaging
when inhaled.
6. Which device is commonly used for short-term radon testing?
A. Geiger counter
B. Charcoal canister
C. Barometer
D. Thermocouple
Charcoal canisters adsorb radon and are widely used for short-term
measurements.
7. Short-term radon tests typically last:
A. 1–6 hours
B. 1 day
C. 2–7 days
D. 30–90 days
Short-term tests generally run from 2 to 7 days to capture radon
fluctuations.
8. Long-term radon testing is usually conducted over:
A. 1–3 days
B. 7–10 days
C. 2 weeks
D. 90 days to 1 year
Long-term tests provide more accurate annual averages by
measuring over extended periods.
, 9. Where should a radon test be placed in a home?
A. Attic
B. Kitchen
C. Lowest livable level
D. Garage
Testing is conducted in the lowest occupied level to assess actual
exposure risk.
10. Closed-house conditions mean:
A. All windows open
B. HVAC system off
C. Windows and doors kept closed except for normal entry/exit
D. No occupants in the house
Closed-house conditions ensure consistent indoor air for accurate
radon measurement.
11. Which factor most affects radon entry into buildings?
A. Paint color
B. Furniture arrangement
C. Soil permeability and pressure differences
D. Lighting conditions
Radon entry depends on soil characteristics and pressure differentials
between indoors and outdoors.
12. What is a working level (WL)?
A. Measurement of air humidity
B. Unit of radon progeny concentration
C. Temperature scale
D. Air pressure measurement
Working level measures the concentration of radon decay products in
air.
13. Continuous radon monitors (CRMs) are used to:
A. Measure water quality
B. Record radon levels continuously over time
C. Detect carbon monoxide
D. Monitor temperature
CRMs provide hourly readings and detect fluctuations and
tampering.
Technician Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which unit is used to measure radon concentration in air in the United
States?
A. Becquerels per cubic meter
B. Picocuries per liter
C. Grams per cubic meter
D. Parts per million
The United States standard unit for measuring radon in air is
picocuries per liter (pCi/L), whereas Bq/m³ is used internationally.
2. What is the EPA action level for indoor radon concentration?
A. 2.0 pCi/L
B. 3.5 pCi/L
C. 4.0 pCi/L
D. 10.0 pCi/L
The EPA recommends mitigation when radon levels reach or exceed
4.0 pCi/L due to increased health risks.
3. Radon is classified as which type of hazard?
A. Chemical hazard
B. Biological hazard
C. Physical hazard
D. Radiological hazard
Radon is a radioactive gas that emits ionizing radiation, making it a
radiological hazard.
,4. What is the primary source of radon in homes?
A. Household cleaning products
B. Soil beneath the structure
C. Outdoor air pollution
D. Water heaters
Radon gas originates from the decay of uranium in soil and enters
buildings through foundation cracks.
5. Which type of radiation is emitted by radon decay products?
A. Beta radiation only
B. Gamma radiation only
C. Alpha radiation primarily
D. Infrared radiation
Radon progeny emit alpha particles, which are highly damaging
when inhaled.
6. Which device is commonly used for short-term radon testing?
A. Geiger counter
B. Charcoal canister
C. Barometer
D. Thermocouple
Charcoal canisters adsorb radon and are widely used for short-term
measurements.
7. Short-term radon tests typically last:
A. 1–6 hours
B. 1 day
C. 2–7 days
D. 30–90 days
Short-term tests generally run from 2 to 7 days to capture radon
fluctuations.
8. Long-term radon testing is usually conducted over:
A. 1–3 days
B. 7–10 days
C. 2 weeks
D. 90 days to 1 year
Long-term tests provide more accurate annual averages by
measuring over extended periods.
, 9. Where should a radon test be placed in a home?
A. Attic
B. Kitchen
C. Lowest livable level
D. Garage
Testing is conducted in the lowest occupied level to assess actual
exposure risk.
10. Closed-house conditions mean:
A. All windows open
B. HVAC system off
C. Windows and doors kept closed except for normal entry/exit
D. No occupants in the house
Closed-house conditions ensure consistent indoor air for accurate
radon measurement.
11. Which factor most affects radon entry into buildings?
A. Paint color
B. Furniture arrangement
C. Soil permeability and pressure differences
D. Lighting conditions
Radon entry depends on soil characteristics and pressure differentials
between indoors and outdoors.
12. What is a working level (WL)?
A. Measurement of air humidity
B. Unit of radon progeny concentration
C. Temperature scale
D. Air pressure measurement
Working level measures the concentration of radon decay products in
air.
13. Continuous radon monitors (CRMs) are used to:
A. Measure water quality
B. Record radon levels continuously over time
C. Detect carbon monoxide
D. Monitor temperature
CRMs provide hourly readings and detect fluctuations and
tampering.
