signed picasso painting needs x-ray attention.

i was wondering if anyone knows how to get an x-ray done on a painting.i have a picasso painting.it is an oil on canvas panel with a painting underneath the original painting.please help.if i could get help having this painting x-rayed professionally i think i could prove this picasso painting and yes it is signed.

Best bet would probably be to phone a local auction house or museum/gallery and ask that very same question...
I assume they'd be able to offer the service or at least know how to go about it...

good luck & let us know once you find out...