If i am pregnant, should i avoid being near someone who gets inpatient radiation treatments for lung cancer?

Safe to visit: As long as you are not exposed to the source of the radiation, it is safe to visit your friend. Call ahead to verify that it is safe for you to visit; most hospitals will limit visits if there is a concern about exposing visitors to radiation - they are especially careful with pregnant people.

Usually no worry: Most radiation treatments for lung cancer do not leave any radiation in the patient. The radiation is only present when the patient is in the room getting treatment and they cannot expose anyone else so there is no risk to even a pregnant family member or friend. However, there are rare surgeries for lung cancer where some radiation seeds are left inside the patient. The patient would know.