Hello My Name Is Wendy, In 2012 My Boyfriend Got

Hello My Name is Wendy, in 2012 My Boyfriend Got in an incident Where He Got Shot 3 Times. The doctors Removed 2 Bullets And Left 1. The bullet They Did not want to Risk and remove is in the side of His head, Telling him It Would be A 50/50 Of Life . My Question is, Yesterday He purchased 2 Six Flag Tickets for Tomorrow So Would Going On Rollercoasters Would It Affect Or move the bullet And cause severe damage? Would it be safe for him to go on the rides?