What Teaching Is Essential for a Client Who Has Received

What teaching is essential for a client who has received an injection of iodine-131?

A) "Do not share a toilet with anyone else or let anyone clean your toilet."
B) "You need to save all your urine for the next week."
C) "No special precautions are needed because this type of radiation is weak."
D) "Avoid all contact with other people until the radiation device is removed."