Technetium-99m Is Used in a Variety of Medical Applications

question 102

Multiple Choice

Technetium-99m is used in a variety of medical applications.It has a half-life of 6 hours.If 100.0 mg of technetium-99m is prepared at 6:00 AM, how many milligrams are still active when it is needed for diagnostic testing at 6:00 PM?

• A) 100.0 mg
• B) 50.0 mg
• C) 25.0 mg
• D) 10.0 mg
• E) 5.00 mg