My son's exposure to X ray

last week, my 2 year old son fell and couldn't walk. so when we took him to emergency room, 5 x ray photos were taken of his feet from all angles.
fortunatelly it was just a sprain and no break.

Is he doomed to have that x ray exposure ingrained in his cells to harm his health?

is there a way to clean his body cells from that x ray exposure?

help!!!