RADIO ACTIVE IODINE: 2 QUESTIONS.....?

It can be injected, swallowed in a capsule, or dissolved in water and gulped down. The doc might give you a straw and Sprite is that's how you would like to take it. Iodine 131 has a half life of about 8 days. Close to 90% of the radioactivity is gone in 3 weeks, and it is completely gone in about 3 months.