I felt nothing, but they say a geiger counter would definitely be clicking. They even gave me a letter to carry in case I had to fly and set off an airport detector (this would be after the first three days during which I couldn't fly at all or even ride a bus).
Sometimes I think they went a bit overboard on caution, but they're the experts.

The radiation generated can extend and be excreted out of the body for awhile after treatment. Typically, patients are told to avoid close contact for a few days. They're told to avoid being within 3 feet of adults for prolonged periods for 2–7 days. Its also advised to sleep in a separate bed from partners, children, or pregnant women for 3–7 days.