i don't think an xray would have any adverse affect on the phone. that red srtip you see is the moisture strip. means if it turns red, you supposedly got the phone wet. but you can't really trust that darn strip because if you're not mindful when you open your battery cover, moisture on your hand can turn it red.
let me see if my psychic ability is kicking in............i see a phone replacement in your near future
you'll either need to call sprint CS to get replacement under warranty, or take it into a sprint store. if you're sure your phone didn't get wet...the sprint store might give you grief about the red moisture strip and tell you you're lying about it not getting wet. but not to worry...any experienced techinician can look deeper into the phone and find out if your phone did get wet or not.