Iodine-123, Which Is Used for Diagnostic Imaging in the Thyroid

question 3

Multiple Choice

Iodine-123, which is used for diagnostic imaging in the thyroid, has a half-life of 13 hours. If 50.0 mg of I-123 were prepared at 8:00 a.m. on Monday, how many mg remain at 10:00 a.m. on the following day?

• A)50.0 mg
• B)25.0 mg
• C)12.5 mg
• D)6.25 mg
• E)3.13 mg

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Definitions:

General Adaptation Syndrome

A three-stage response (alarm, resistance, exhaustion) that the body goes through when under stress, as proposed by Hans Selye.

Resistance Phase

The second stage of the general adaptation syndrome, characterized by the body's adaptation to a continuous stressor and an attempt to restore homeostasis.

Minor Frustrations

Small, often daily, annoyances or irritations that can accumulate and affect mood or well-being.

Realistic Optimists

Individuals who maintain a positive outlook on life while still being grounded in reality, acknowledging potential obstacles and planning accordingly.