A Hospital Patient Has Been Given Some 131I (Half-Life =

question 55

Multiple Choice

A hospital patient has been given some 131I (half-life = 8.04 d) which decays at 4.2 times the acceptable level for exposure to the general public. How long must the patient wait for the decay rate to reach the acceptable level? Assume that the material merely decays and is not excreted by the body.

• A) 17 d
• B) 12 d
• C) 8.0 d
• D) 7.2 d

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Autonomic Nervous System

Part of the peripheral nervous system that controls involuntary bodily functions like heartbeat, digestion, and breathing.

Physiological Arousal

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Emotional Arousal

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