The air in some caves contains radon gas, 222Rn which can lead to lung cancer from a prolonged exposure. In some Irish caves, the air in the cave has an activity per volume of 1.55 × 105 Bq/m3. Suppose that you spend two full days in that cave. Approximately how many 222Rn atoms would enter into and out of your lungs during your two-day stay? Take the half-life of 222Rn to be 3.82 days. You will need to estimate your lung capacity and average breathing rate.

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