Iodine-131 Has a Half-Life of 8

question 49

Multiple Choice

Iodine-131 has a half-life of 8.1 days and is used as a tracer for the thyroid gland. If a patient drinks a sodium iodide (NaI) solution containing iodine-131 on a Tuesday, how many days will it take for the concentration of iodine-131 to drop to 5.0% of its initial concentration?

• A)19 days
• B)0.81 day
• C)8.1 days
• D)35 days
• E)4.3 days

---

Definitions:

Cartel

An agreement among competing firms to control prices or exclude entry of a new competitor in a market.

Video Game Players

Individuals who engage in playing video games as a hobby or professionally.

Geographical Area

Refers to a specific physical region or location on Earth, identified by its natural or human-made characteristics.

Effective Cartel

A group of independent market participants who collude to increase their profits by attempting to manipulate market prices or limit market supply.