RMS Radon Science & Health Effects 1 — Questions and Answers
Question 1: What element does radon decay from in the uranium decay series?
- Radium-226 (Correct answer)
- Carbon-14
- Potassium-40
- Strontium-90
Correct answer: Radium-226
Radon-222 is a decay product of Radium-226, which itself is part of the Uranium-238 decay series. Radon is the only gaseous element in this chain.
Question 2: Why is radon considered the second leading cause of lung cancer in the United States?
- Its radioactive decay products lodge in lung tissue and emit alpha radiation that damages DNA (Correct answer)
- It causes chemical burns to the airway lining
- It depletes oxygen in enclosed spaces
- It reacts with hemoglobin in blood
Correct answer: Its radioactive decay products lodge in lung tissue and emit alpha radiation that damages DNA
Radon's short-lived decay products (polonium-218 and polonium-214) attach to dust particles, are inhaled, and lodge in lung tissue where they emit alpha radiation that damages cellular DNA, potentially causing cancer.
Question 3: What is the half-life of radon-222?
- 3.8 days (Correct answer)
- 30 seconds
- 100 years
- 1 hour
Correct answer: 3.8 days
Radon-222 has a half-life of approximately 3.8 days, meaning half of any given amount will decay into its progeny in that time period.
Question 4: Which U.S. geographic areas tend to have the highest radon potential?
- Northern states and areas with granite bedrock and glacial deposits (Correct answer)
- Only coastal areas along the Pacific Ocean
- Exclusively desert regions of the Southwest
- Only states along the Gulf of Mexico
Correct answer: Northern states and areas with granite bedrock and glacial deposits
EPA Zone 1 (highest radon potential) includes many northern states, areas with granitic and shale bedrock, and regions with glacial deposits, though elevated radon can occur anywhere.
Question 5: What unit of measurement is used for radon concentration in the United States?
- Picocuries per liter (pCi/L) (Correct answer)
- Parts per million (ppm)
- Milligrams per liter (mg/L)
- Becquerels per cubic meter (Bq/m³) only
Correct answer: Picocuries per liter (pCi/L)
The United States uses picocuries per liter (pCi/L) as the standard unit for measuring radon concentration in air, while most other countries use becquerels per cubic meter.
Question 6: What is the synergistic effect of radon exposure and smoking?
- Combined exposure to radon and tobacco smoke multiplies lung cancer risk far beyond either risk alone (Correct answer)
- Smoking protects against radon exposure
- Radon neutralizes the effects of tobacco smoke
- There is no interaction between radon and smoking
Correct answer: Combined exposure to radon and tobacco smoke multiplies lung cancer risk far beyond either risk alone
Radon and smoking have a synergistic (multiplicative) effect on lung cancer risk. A smoker exposed to elevated radon has a dramatically higher risk than the individual risks combined.
RMS Radon Science & Health Effects 1
What element does radon decay from in the uranium decay series?