CeCe,

If she is concerned, get them to place lead over the areas that are not being x-rayed... throat and overies.
When MJ had an Xray on her lungs i insisted that she had lead everywhere else and there was no fuss, they were fine with it.
In fact if i have an xray, i ask for lead... i had a wrist one (XR) and wore an apron, i got a funny look, but i told them that at the time i was TTC so they had no problem

Wish her luck xx