RMS Radon Science & Health Effects 3

Question 1

What is the definition of one Working Level (WL) in radon measurement?

Accepted Answer

Any combination of radon progeny releasing 1.3 × 10⁵ MeV of potential alpha energy per liter of air

Answer

One WL is defined as any combination of short-lived radon progeny that releases 1.3 × 10⁵ MeV of potential alpha energy per liter of air.

Question 2

Radon-222 has a half-life of approximately 3.8 days. If a sealed container starts with 800 pCi, how much remains after 7.6 days?

Accepted Answer

200 pCi

Answer

7.6 days equals two half-lives: 800 → 400 → 200 pCi.

Question 3

Which organ is the primary target for radiation damage from inhaled radon progeny?

Accepted Answer

Bronchial epithelium of the lung

Answer

Alpha particles from radon progeny have a short range but deposit all their energy in the nearby bronchial epithelial cells where carcinomas develop.

Question 4

A basement measures 8 pCi/L. What is the approximate working level (WL) if the equilibrium factor is 0.5?

Accepted Answer

0.16 WL

Answer

WL = (pCi/L × F) / 100 = (8 × 0.5) / 100 = 0.04... — wait, actually WL = pCi/L × F / 100 = 8 × 0.5 / 100 = 0.04... Let me recalculate: WL = (radon pCi/L × 0.5) / 100 = 4/100 = 0.04... However using the standard formula WL = pCi/L / 200 at F=0.5: 8/200 = 0.04, but the closest answer is 0.16 using F=0.5 and WL=pCi/L × F / 100 × 4... The correct simplified formula is: WL ≈ (pCi/L × F) / 100 = (8 × 0.5)/100 = 0.04. Correcting to 0.04 WL.

Question 5

The BEIR VI report estimated that radon causes approximately what percentage of all lung cancer deaths in the United States?

Accepted Answer

10–15%

Answer

The BEIR VI report estimated radon is responsible for approximately 10–15% of all lung cancer deaths, making it the second leading cause after smoking.

(RMS) Radon Mitigation Specialist Practice Test

(RMS) Radon Mitigation Specialist Practice Test

RMS Radon Science & Health Effects 3