New Jersey Radon Measurement Technician
Exam With Actual Questions & Verified
Answers,Explained Rationales/Expert Verified
For Guaranteed Pass 2026/Latest
Update/Instant Download Pdf
1. What is the primary source of indoor radon in most buildings?
A) Household cleaning products
B) Soil and rock beneath the foundation
C) Building insulation
D) Indoor combustion appliances
Answer: B
Rationale: Radon gas originates from the natural decay of
uranium in soil and rock and enters buildings through foundation
cracks and openings.
2. Radon is best described as which type of gas?
A) Synthetic industrial gas
B) Visible radioactive vapor
C) Colorless, odorless, radioactive gas
D) Toxic chemical gas with smell
Answer: C
Rationale: Radon is a naturally occurring, colorless, odorless, and
tasteless radioactive gas.
3. The half-life of radon-222 is approximately:
A) 24 hours
B) 3.8 days
C) 30 days
D) 1 year
, Answer: B
Rationale: Radon-222 has a half-life of about 3.8 days, allowing
it to migrate from soil into buildings.
4. 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 increases the risk of lung
cancer due to inhalation of radioactive decay products.
5. What unit is commonly used to measure radon concentration in
air?
A) Becquerel per liter (Bq/L)
B) Watts per meter
C) Volts per meter
D) Parts per million (ppm)
Answer: A
Rationale: Radon concentration is often expressed in picocuries
per liter (pCi/L) in the U.S. or becquerels per liter internationally.
6. 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
Answer: C
Rationale: The EPA recommends mitigation if radon levels are
4.0 pCi/L or higher.
, 7. Which factor most influences radon entry into a building?
A) Roof color
B) Soil pressure differentials
C) Wall paint type
D) Electrical wiring
Answer: B
Rationale: Pressure differences between soil and indoor air drive
radon entry into structures.
8. Short-term radon tests typically last:
A) 1–2 days
B) 2–90 days
C) 6 months
D) 1 year
Answer: B
Rationale: Short-term tests usually range from 2 to 90 days
depending on device type.
9. Which device is commonly used for continuous radon monitoring?
A) Thermometer
B) Continuous Radon Monitor (CRM)
C) Hygrometer
D) Barometer
Answer: B
Rationale: CRMs provide continuous measurements and can
detect fluctuations in radon levels.
10. The best location for placing a radon test device is:
A) Kitchen
B) Basement near exterior door
C) Lowest lived-in level
D) Attic
Exam With Actual Questions & Verified
Answers,Explained Rationales/Expert Verified
For Guaranteed Pass 2026/Latest
Update/Instant Download Pdf
1. What is the primary source of indoor radon in most buildings?
A) Household cleaning products
B) Soil and rock beneath the foundation
C) Building insulation
D) Indoor combustion appliances
Answer: B
Rationale: Radon gas originates from the natural decay of
uranium in soil and rock and enters buildings through foundation
cracks and openings.
2. Radon is best described as which type of gas?
A) Synthetic industrial gas
B) Visible radioactive vapor
C) Colorless, odorless, radioactive gas
D) Toxic chemical gas with smell
Answer: C
Rationale: Radon is a naturally occurring, colorless, odorless, and
tasteless radioactive gas.
3. The half-life of radon-222 is approximately:
A) 24 hours
B) 3.8 days
C) 30 days
D) 1 year
, Answer: B
Rationale: Radon-222 has a half-life of about 3.8 days, allowing
it to migrate from soil into buildings.
4. 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 increases the risk of lung
cancer due to inhalation of radioactive decay products.
5. What unit is commonly used to measure radon concentration in
air?
A) Becquerel per liter (Bq/L)
B) Watts per meter
C) Volts per meter
D) Parts per million (ppm)
Answer: A
Rationale: Radon concentration is often expressed in picocuries
per liter (pCi/L) in the U.S. or becquerels per liter internationally.
6. 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
Answer: C
Rationale: The EPA recommends mitigation if radon levels are
4.0 pCi/L or higher.
, 7. Which factor most influences radon entry into a building?
A) Roof color
B) Soil pressure differentials
C) Wall paint type
D) Electrical wiring
Answer: B
Rationale: Pressure differences between soil and indoor air drive
radon entry into structures.
8. Short-term radon tests typically last:
A) 1–2 days
B) 2–90 days
C) 6 months
D) 1 year
Answer: B
Rationale: Short-term tests usually range from 2 to 90 days
depending on device type.
9. Which device is commonly used for continuous radon monitoring?
A) Thermometer
B) Continuous Radon Monitor (CRM)
C) Hygrometer
D) Barometer
Answer: B
Rationale: CRMs provide continuous measurements and can
detect fluctuations in radon levels.
10. The best location for placing a radon test device is:
A) Kitchen
B) Basement near exterior door
C) Lowest lived-in level
D) Attic
