New Jersey Radon Technician Review Questions ALL QUESTIONS AND CORRECT
ANSWERS VERIFIED ANSWERS GRADED A+ NEWEST EXAM (JUST RELEASED).
New Jersey Radon Technician Review: 170 Practice Questions with Answers and
Rationales
This comprehensive review is designed for the New Jersey Radon Technician
Certification Exam, aligned with N.J.A.C. 7:28-27 regulations, EPA protocols, and
ANSI/AARST standards. Questions are formatted as multiple choice with verified
answers and detailed rationales.
Part 1: Radon Fundamentals & Health Effects (Questions 1-25)
1. Radon is primarily produced from the decay of which element?
A. Carbon-14
B. Uranium-238
C. Radium-226
D. Thorium-232
Answer: C. Radium-226
Rationale: While radon-222 ultimately comes from uranium-238 decay, the direct
parent isotope that decays to produce radon gas is radium-226. Uranium-238
decays through multiple steps including thorium-234, protactinium-234, uranium-
,234, and thorium-230 before reaching radium-226, which then decays to radon-
222.
2. Which property best describes radon gas?
A. Visible with a greenish-yellow color
B. Colorless, odorless, and tasteless
C. Sweet-smelling with a metallic taste
D. Blue-colored and pungent
Answer: B. Colorless, odorless, and tasteless
Rationale: Radon is a radioactive noble gas that cannot be detected by human
senses. This makes it particularly dangerous because specialized measurement
devices are required for detection. It is chemically inert and does not react with
other substances.
3. The EPA's recommended action level for radon in indoor air is:
A. 2.0 pCi/L
B. 4.0 pCi/L
C. 6.0 pCi/L
,D. 10.0 pCi/L
Answer: B. 4.0 pCi/L
Rationale: The U.S. Environmental Protection Agency (EPA) recommends that
homeowners take action to mitigate radon levels at or above 4.0 picocuries per
liter (pCi/L). The World Health Organization (WHO) recommends a lower action
level of 2.7 pCi/L (100 Bq/m³). Even levels below 4.0 pCi/L carry some risk.
4. At 4 pCi/L, the risk of lung cancer for smokers is approximately:
A. 7/1,000 smokers
B. 62/1,000 smokers
C. 200/1,000 smokers
D. 1/1,000 smokers
Answer: B. 62/1,000 smokers
Rationale: At the EPA action level of 4 pCi/L, approximately 62 out of 1,000
smokers will develop lung cancer due to radon exposure. For non-smokers at the
same level, the risk drops to about 7 out of 1,000. This demonstrates the
synergistic effect between smoking and radon.
, 5. Which statement about radon decay products (progeny) is correct?
A. Radon decay products are stable and non-radioactive
B. The primary health risk comes from radon gas itself, not its progeny
C. Radon decay products are solid particles that attach to lung tissue
D. Radon progeny have no effect on the respiratory system
Answer: C. Radon decay products are solid particles that attach to lung tissue
Rationale: When radon gas decays, it produces solid radioactive particles called
radon progeny or daughters. These include polonium-218, lead-214, bismuth-214,
and polonium-214. When inhaled, these particles can attach to lung tissue and
continue to emit alpha particles, causing DNA damage and increasing lung cancer
risk.
6. Which of the following is NOT a radon decay product?
A. Polonium-218
B. Lead-214
C. Carbon-14
D. Bismuth-214
ANSWERS VERIFIED ANSWERS GRADED A+ NEWEST EXAM (JUST RELEASED).
New Jersey Radon Technician Review: 170 Practice Questions with Answers and
Rationales
This comprehensive review is designed for the New Jersey Radon Technician
Certification Exam, aligned with N.J.A.C. 7:28-27 regulations, EPA protocols, and
ANSI/AARST standards. Questions are formatted as multiple choice with verified
answers and detailed rationales.
Part 1: Radon Fundamentals & Health Effects (Questions 1-25)
1. Radon is primarily produced from the decay of which element?
A. Carbon-14
B. Uranium-238
C. Radium-226
D. Thorium-232
Answer: C. Radium-226
Rationale: While radon-222 ultimately comes from uranium-238 decay, the direct
parent isotope that decays to produce radon gas is radium-226. Uranium-238
decays through multiple steps including thorium-234, protactinium-234, uranium-
,234, and thorium-230 before reaching radium-226, which then decays to radon-
222.
2. Which property best describes radon gas?
A. Visible with a greenish-yellow color
B. Colorless, odorless, and tasteless
C. Sweet-smelling with a metallic taste
D. Blue-colored and pungent
Answer: B. Colorless, odorless, and tasteless
Rationale: Radon is a radioactive noble gas that cannot be detected by human
senses. This makes it particularly dangerous because specialized measurement
devices are required for detection. It is chemically inert and does not react with
other substances.
3. The EPA's recommended action level for radon in indoor air is:
A. 2.0 pCi/L
B. 4.0 pCi/L
C. 6.0 pCi/L
,D. 10.0 pCi/L
Answer: B. 4.0 pCi/L
Rationale: The U.S. Environmental Protection Agency (EPA) recommends that
homeowners take action to mitigate radon levels at or above 4.0 picocuries per
liter (pCi/L). The World Health Organization (WHO) recommends a lower action
level of 2.7 pCi/L (100 Bq/m³). Even levels below 4.0 pCi/L carry some risk.
4. At 4 pCi/L, the risk of lung cancer for smokers is approximately:
A. 7/1,000 smokers
B. 62/1,000 smokers
C. 200/1,000 smokers
D. 1/1,000 smokers
Answer: B. 62/1,000 smokers
Rationale: At the EPA action level of 4 pCi/L, approximately 62 out of 1,000
smokers will develop lung cancer due to radon exposure. For non-smokers at the
same level, the risk drops to about 7 out of 1,000. This demonstrates the
synergistic effect between smoking and radon.
, 5. Which statement about radon decay products (progeny) is correct?
A. Radon decay products are stable and non-radioactive
B. The primary health risk comes from radon gas itself, not its progeny
C. Radon decay products are solid particles that attach to lung tissue
D. Radon progeny have no effect on the respiratory system
Answer: C. Radon decay products are solid particles that attach to lung tissue
Rationale: When radon gas decays, it produces solid radioactive particles called
radon progeny or daughters. These include polonium-218, lead-214, bismuth-214,
and polonium-214. When inhaled, these particles can attach to lung tissue and
continue to emit alpha particles, causing DNA damage and increasing lung cancer
risk.
6. Which of the following is NOT a radon decay product?
A. Polonium-218
B. Lead-214
C. Carbon-14
D. Bismuth-214
