I suppose they could excite the valence electrons enough to jump to an unstable orbit if the x-rays are at their highest strength. That might be enough to convert your test cyp to a 19-nor like deca or tren. You should be able to tell if the suspension gets cloudy or changes color though.
You could shield your meds in a lead case wrapped in tin foil or simply put them in a bag and ask them to hand check it. Kind of like people used to do with old fashioned film cameras.