Metallic bodies are provided having a lithium layer and a metallic substrate. The metallic bodies can exhibit increased resistance to radiation-induced deformations such as blistering. Methods are provided for transitioning the metallic bodies into more blister resistant configurations, as our methods for diminishing or eliminating blisters previously formed. Systems for utilizing the metallic bodies and methods are also disclosed.

A system (20) for tissue ablation includes a probe (22), an expandable capsule (50), a voltage discharge device (210), and a generator (49). The probe is configured to be inserted into a cavity of an organ of a patient. The expandable capsule is fitted at a distal end of the probe and configured to be expanded within the cavity and to be filled with a gas (250). The voltage discharge device is fitted inside the expandable capsule and is configured to create plasma by electrical excitation of the gas that fills the expandable capsule, the plasma emitting X-rays (270), so as to ablate tissue in the cavity using the X-rays. The generator is wired to the voltage discharge device to apply electrical signals that electrically excite the plasma.