Hi: I had seeds placed on the other side of my body (my tongue) one year ago. I had some later problems due to the weakening of my tongue but other than that I did not know they were there. In fact, they are still there but the radiation half life has rendered them non radioactive. In general I think these work well and are basically non intrusive. If your wife is also getting beam radiation talk about it with your doctor as in my case the combination was very bad causing burning of my esophegus. Good luck. Ed