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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Definitions:

Medulla

Refers to the medulla oblongata, the lower portion of the brainstem, which controls vital body functions such as breathing and heart rate.

Cerebellum

A region of the brain that plays an important role in motor control, and may also be involved in some cognitive functions such as attention and language.

Hypothalamus

A region of the brain below the thalamus, responsible for coordinating both the autonomic nervous system and the activity of the pituitary, controlling body temperature, thirst, hunger, and other homeostatic systems.

Constantly Wants

The continuous desire or need for something, often reflecting a deep-seated psychological or emotional gap.