Question

Technetium-99 is used for brain scans. The isotope has a half-life of 6 hours. A laboratory needs 200 g for an experiment. If shipments takes 72 hours, how much Technetium-99 should be prepared so that the appropriate amount remains after shipping?

Answer 1

Do you know the functions e and ln?

Answer 2

no

Answer 3

I think you start out by 72/6= 12 half-lives

Answer 4

Not even close.

Do you have a e and ln in your scientific calculator.