Radon ²²²Rn Is a Radioactive Gas Produced as Part of the Natural

question 53

Multiple Choice

Radon ²²²Rn is a radioactive gas produced as part of the natural decay chain of uranium. Because it is a gas, it can pose a health problem through inhalation, especially when high concentrations accumulate in homes. Suppose 5 × 10⁸ radon atoms are present in a basement at some time. If the basement is sealed and left, then how many radon atoms remain after a month 31 days) ? The half-life of ²²²Rn is 3.82 days.)

• A) 1.81 × 10⁶
• B) 1.49 × 10⁵
• C) 1.23 × 10⁶
• D) 6.16 × 10⁷
• E) None of these is correct.

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